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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-10-30 21:50:32 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-11 21:23:48 +0200 |
| commit | 3293cf065ec926fcd00c705b96e6f9537b3f3425 (patch) | |
| tree | b0a61fd6007a8baf6030b59b8416b3599116df4e | |
| parent | 9162b1a60dbd427a3c3a0e2353efae21e9fb9a25 (diff) | |
| download | ffmpeg-3293cf065ec926fcd00c705b96e6f9537b3f3425.tar.gz | |
avformat/mpc8: correct integer overflow in mpc8_parse_seektable()
Fixes: signed integer overflow: -4683718486770919638 * 2 cannot be represented in type 'long'
Fixes: 26704/clusterfuzz-testcase-minimized-ffmpeg_dem_MPC8_fuzzer-6327056939614208
Fixes: 27550/clusterfuzz-testcase-minimized-ffmpeg_dem_MPC8_fuzzer-6259212652642304
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0897402ac8a2045691395380a9fd2ea88c0d3798)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mpc8.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c index e42008d74f..4bbee8f3b3 100644 --- a/libavformat/mpc8.c +++ b/libavformat/mpc8.c @@ -181,7 +181,7 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off) t += get_bits(&gb, 12); if(t & 1) t = -(t & ~1); - pos = (t >> 1) + ppos[0]*2 - ppos[1]; + pos = (t >> 1) + (uint64_t)ppos[0]*2 - ppos[1]; av_add_index_entry(s->streams[0], pos, (int64_t)i << seekd, 0, 0, AVINDEX_KEYFRAME); ppos[1] = ppos[0]; ppos[0] = pos; |