Hello,
I found a heap buffer overflow in ok_wav.c: ok_wav_decode_ms_ima_adpcm_data, line 613.
In detail, my testcase's input size is 2, but in line 613, the code access input[2], so here is a accessing out of range.
The AddressSanitizer report is as follows:
`=================================================================
==2819==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000032 at pc 0x561bab18f205 bp 0x7ffe9b880ec0 sp 0x7ffe9b880eb0
READ of size 1 at 0x602000000032 thread T0
#0 0x561bab18f204 in ok_wav_decode_ms_ima_adpcm_data (a.out+0x6204)
#1 0x561bab191550 in ok_wav_decode_data (a.out+0x8550)
#2 0x561bab192452 in ok_wav_decode_wav_file (a.out+0x9452)
#3 0x561bab193718 in ok_wav_decode (a.out+0xa718)
#4 0x561bab18bb43 in ok_wav_read_with_allocator (a.out+0x2b43)
#5 0x561bab18b9a4 in ok_wav_read (a.out+0x29a4)
#6 0x561bab1939de in main (a.out+0xa9de)
#7 0x7f719902e082 in __libc_start_main ../csu/libc-start.c:308
#8 0x561bab18b40d in _start (a.out+0x240d)

0x602000000032 is located 0 bytes to the right of 2-byte region [0x602000000030,0x602000000032)
allocated by thread T0 here:
#0 0x7f7199309808 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144
#1 0x561bab18b6d7 in ok_stdlib_alloc (a.out+0x26d7)
#2 0x561bab18ee47 in ok_wav_decode_ms_ima_adpcm_data (a.out+0x5e47)
#3 0x561bab191550 in ok_wav_decode_data (a.out+0x8550)
#4 0x561bab192452 in ok_wav_decode_wav_file (a.out+0x9452)
#5 0x561bab193718 in ok_wav_decode (a.out+0xa718)
#6 0x561bab18bb43 in ok_wav_read_with_allocator (a.out+0x2b43)
#7 0x561bab18b9a4 in ok_wav_read (a.out+0x29a4)
#8 0x561bab1939de in main (a.out+0xa9de)
#9 0x7f719902e082 in __libc_start_main ../csu/libc-start.c:308

SUMMARY: AddressSanitizer: heap-buffer-overflow (a.out+0x6204) in ok_wav_decode_ms_ima_adpcm_data
Shadow bytes around the buggy address:
0x0c047fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c047fff8000: fa fa 00 fa fa fa[02]fa fa fa fa fa fa fa fa fa
0x0c047fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
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
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==2819==ABORTING`
The testcase trigger this I'll upload to my github soon.