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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>
This commit is contained in:
Michael Niedermayer 2020-10-30 21:50:32 +01:00
parent ad3e495657
commit 0897402ac8
1 changed files with 1 additions and 1 deletions
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2
libavformat/mpc8.c
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@ -182,7 +182,7 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
t += get_bits(&gb, 12); t += get_bits(&gb, 12);
if(t & 1) if(t & 1)
t = -(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); av_add_index_entry(s->streams[0], pos, (int64_t)i << seekd, 0, 0, AVINDEX_KEYFRAME);
ppos[1] = ppos[0]; ppos[1] = ppos[0];
ppos[0] = pos; ppos[0] = pos;