heap-buffer-overflow occurred when running program ffmpeg in av_crc at crc.c

[Du4t]

Summary of the bug: heap-buffer-overflow occurred when running program ffmpeg in av_crc at crc.c:403

How to reproduce:

% git log
commit 73b3344edd39468cb3f729d613949f52dbcba84e (HEAD -> master, origin/master, origin/HEAD)
Author: Niklas Haas <git@haasn.dev>
Date:   Tue Oct 1 12:32:29 2024 +0200

% ffmpeg -avioflags direct  -i PoC /dev/null
ffmpeg version N-117413-g73b3344edd Copyright (c) 2000-2024 the FFmpeg developers
  built with Ubuntu clang version 14.0.0-1ubuntu1.1
  configuration: --cc=clang-14 --cxx=clang++-14 --prefix=/home/du4t/target/FFmpeg/asan-release --toolchain=clang-asan --disable-shared --disable-stripping
  libavutil      59. 41.100 / 59. 41.100
  libavcodec     61. 21.100 / 61. 21.100
  libavformat    61.  9.100 / 61.  9.100
  libavdevice    61.  4.100 / 61.  4.100
  libavfilter    10.  6.100 / 10.  6.100
  libswscale      8.  4.100 /  8.  4.100
  libswresample   5.  4.100 /  5.  4.100
[ogg @ 0x617000000080] CRC mismatch!
=================================================================
==1185968==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62d000012400 at pc 0x5acc7d21a0d5 bp 0x7fffa6cb2170 sp 0x7fffa6cb2168
READ of size 4 at 0x62d000012400 thread T0
    #0 0x5acc7d21a0d4 in av_crc FFmpeg/libavutil/crc.c:403:20
    #1 0x5acc7a365df6 in ff_crc04C11DB7_update FFmpeg/libavformat/aviobuf.c:568:12
    #2 0x5acc7a365ece in ffio_get_checksum FFmpeg/libavformat/aviobuf.c:585:19
    #3 0x5acc7a612610 in ogg_read_page FFmpeg/libavformat/oggdec.c:378:15
    #4 0x5acc7a610e4d in ogg_packet FFmpeg/libavformat/oggdec.c:518:19
    #5 0x5acc7a60e610 in ogg_read_header FFmpeg/libavformat/oggdec.c:737:15
    #6 0x5acc7a3a45c8 in avformat_open_input FFmpeg/libavformat/demux.c:305:20
    #7 0x5acc7997aee3 in ifile_open FFmpeg/fftools/ffmpeg_demux.c:1727:11
    #8 0x5acc799c072f in open_files FFmpeg/fftools/ffmpeg_opt.c:1334:15
    #9 0x5acc799c072f in ffmpeg_parse_options FFmpeg/fftools/ffmpeg_opt.c:1374:11
    #10 0x5acc799ee79f in main FFmpeg/fftools/ffmpeg.c:974:11
    #11 0x7de66c429d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #12 0x7de66c429e3f in __libc_start_main csu/../csu/libc-start.c:392:3
    #13 0x5acc798af994 in _start (/home/du4t/target/FFmpeg/asan-release/bin/ffmpeg+0x8bf994) (BuildId: c49a31b3f5b8cb19958f8bbbbf47bfaf1f9a9139)

[mkver]

Fixed by 987c955cd7e972d9940284fa6ae7187ac858ebb1.