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Code Issues Releases Activity

avformat/mpc8: correct 32bit timestamp truncation

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Fixes: left shift of 65536 by 15 places cannot be represented in type 'int'
Fixes: 26801/clusterfuzz-testcase-minimized-ffmpeg_dem_MPC8_fuzzer-5164313092030464

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 ad3e495657)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-03 01:14:26 +01:00
parent 40f056abed
commit 2cb42f5cc0
1 changed files with 2 additions and 2 deletions
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4
libavformat/mpc8.c
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@ -182,7 +182,7 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
if(t & 1)
t = -(t & ~1);
pos = (t >> 1) + ppos[0]*2 - ppos[1];
av_add_index_entry(s->streams[0], pos, 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[0] = pos;
}
@ -257,7 +257,7 @@ static int mpc8_read_header(AVFormatContext *s)
st->codecpar->channels = (st->codecpar->extradata[1] >> 4) + 1;
st->codecpar->sample_rate = mpc8_rate[st->codecpar->extradata[0] >> 5];
avpriv_set_pts_info(st, 32, 1152 << (st->codecpar->extradata[1]&3)*2, st->codecpar->sample_rate);
avpriv_set_pts_info(st, 64, 1152 << (st->codecpar->extradata[1]&3)*2, st->codecpar->sample_rate);
st->start_time = 0;
st->duration = c->samples / (1152 << (st->codecpar->extradata[1]&3)*2);
size -= avio_tell(pb) - pos;