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avformat/iamf_reader: Check len before summing 

Fixes: integer overflow
Fixes: 67275/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5438920751906816
Fixes: 67688/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5970342318243840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-03-25 03:38:27 +01:00
parent d6ed6f6e8d
commit f26ee6e066
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GPG Key ID: B18E8928B3948D64
1 changed files with 2 additions and 2 deletions
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libavformat/iamf_reader.c
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@ -284,9 +284,9 @@ int ff_iamf_read_packet(AVFormatContext *s, IAMFDemuxContext *c,
len = ff_iamf_parse_obu_header(header, size, &obu_size, &start_pos, &type,
&skip_samples, &discard_padding);
if (len < 0 || obu_size > max_size) {
if (len < 0 || obu_size > max_size || len > INT_MAX - read) {
av_log(s, AV_LOG_ERROR, "Failed to read obu\n");
return len;
return len < 0 ? len : AVERROR_INVALIDDATA;
}
avio_seek(pb, -(size - start_pos), SEEK_CUR);