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avformat/dhav: Use 64bit seek_back

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Fixes: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_DHAV_fuzzer-6604736532447232

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 2022-09-17 21:54:31 +02:00
parent d4bb4e3759
commit 10453f5192
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GPG Key ID: B18E8928B3948D64
1 changed files with 1 additions and 1 deletions
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libavformat/dhav.c
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@ -242,7 +242,7 @@ static int64_t get_duration(AVFormatContext *s)
avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET);
while (avio_tell(s->pb) > 12 && max_interations--) {
if (avio_rl32(s->pb) == MKTAG('d','h','a','v')) {
int seek_back = avio_rl32(s->pb);
int64_t seek_back = avio_rl32(s->pb);
avio_seek(s->pb, -seek_back, SEEK_CUR);
read_chunk(s);