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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-16 23:12:42 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-10-16 21:19:24 +0200 |
| commit | e295b5f3d38f66ba65d3df144fadf57a474de711 (patch) | |
| tree | 140fd75c649e6165f751ec1ea69acb0fba20c38e | |
| parent | 0699b0836d00dd2b6d7e6161babaea9e2c1bd709 (diff) | |
| download | ffmpeg-e295b5f3d38f66ba65d3df144fadf57a474de711.tar.gz | |
avformat/mpegts: use actually read packet size in mpegts_resync special case
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>
(cherry picked from commit 83b2e4c8f15a00f037040131e26e20de83f0d842)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mpegts.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c index 3441e238dc..70b71c2a70 100644 --- a/libavformat/mpegts.c +++ b/libavformat/mpegts.c @@ -2634,8 +2634,8 @@ static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *curren int64_t back = FFMIN(seekback, pos); //Special case for files like 01c56b0dc1.ts - if (current_packet[0] == 0x80 && current_packet[12] == 0x47) { - avio_seek(pb, 12 - back, SEEK_CUR); + if (current_packet[0] == 0x80 && current_packet[12] == 0x47 && pos >= TS_PACKET_SIZE) { + avio_seek(pb, 12 - TS_PACKET_SIZE, SEEK_CUR); return 0; } |