$ ./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
mJS revision
Commit: b1b6eac
Build platform
Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)
Build steps
Test case
poc.js
Execution steps & Output
Credits: Found by OWL337 team.