Evil Memory Read in import_function

[haruki3hhh]

version

e81176b

compile

make vmir.asan

asan report

root@9dc6ce043bcb:~/Ablation/vmir/crashes# ../vmir.asan id:000010,sig:11,src:000000,op:havoc,rep:2
AddressSanitizer:DEADLYSIGNAL
=================================================================
==4108536==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x55f249e29d41 bp 0x7ffe007128c0 sp 0x7ffe00712880 T0)
==4108536==The signal is caused by a READ memory access.
==4108536==Hint: address points to the zero page.
    #0 0x55f249e29d40 in import_function src/vmir_wasm_parser.c:246
    #1 0x55f249e2a43d in wasm_parse_section_import_decl src/vmir_wasm_parser.c:325
    #2 0x55f249e31917 in wasm_parse_module src/vmir_wasm_parser.c:1404
    #3 0x55f249e341a0 in vmir_load src/vmir.c:920
    #4 0x55f249d9b9c9 in main src/main.c:166
    #5 0x7fc70dbe6082 in __libc_start_main ../csu/libc-start.c:308
    #6 0x55f249d9ad2d in _start (/root/Ablation/vmir/vmir.asan+0x12d2d)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV src/vmir_wasm_parser.c:246 in import_function
==4108536==ABORTING

reproduce

./vmir https://github.com/haruki3hhh/fuzzing/blob/main/vmir/id%3A000010%2Csig%3A11%2Csrc%3A000000%2Cop%3Ahavoc%2Crep%3A2