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avformat/mpegts: use actually read packet size in mpegts_resync special case

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Fixes: infinite loop
Fixes: 37986/clusterfuzz-testcase-minimized-ffmpeg_dem_MPEGTSRAW_fuzzer-5292311517462528 -

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-09-16 23:12:42 +02:00
parent 6e859d2bdb
commit 83b2e4c8f1
1 changed files with 2 additions and 2 deletions
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4
libavformat/mpegts.c
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@ -2875,8 +2875,8 @@ static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *curren
int64_t back = FFMIN(seekback, pos); int64_t back = FFMIN(seekback, pos);
//Special case for files like 01c56b0dc1.ts //Special case for files like 01c56b0dc1.ts
if (current_packet[0] == 0x80 && current_packet[12] == 0x47) { if (current_packet[0] == 0x80 && current_packet[12] == 0x47 && pos >= TS_PACKET_SIZE) {
avio_seek(pb, 12 - back, SEEK_CUR); avio_seek(pb, 12 - TS_PACKET_SIZE, SEEK_CUR);
return 0; return 0;
} }