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avformat/cafdec: dont seek beyond 64bit 

Fixes: signed integer overflow: 64 + 9223372036854775807 cannot be represented in type 'long long'
Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6418242730328064
Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6418242730328064

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 2023-09-30 00:38:17 +02:00
parent d384af5226
commit d973fcbcc2
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1 changed files with 1 additions and 1 deletions
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libavformat/cafdec.c
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@ -271,7 +271,7 @@ static int read_pakt_chunk(AVFormatContext *s, int64_t size)
}
}
if (avio_tell(pb) - ccount > size) {
if (avio_tell(pb) - ccount > size || size > INT64_MAX - ccount) {
av_log(s, AV_LOG_ERROR, "error reading packet table\n");
return AVERROR_INVALIDDATA;
}