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avformat/flvdec: Treat high ts byte as unsigned

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Fixes: left shift of 255 by 24 places cannot be represented in type 'int'
Fixes: 27516/clusterfuzz-testcase-minimized-ffmpeg_dem_KUX_fuzzer-5152854660349952

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit f514113cfa)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-23 21:42:23 +01:00
parent 4e08ecb7a4
commit 73bc98119c
1 changed files with 1 additions and 1 deletions
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libavformat/flvdec.c
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@ -1179,7 +1179,7 @@ retry_duration:
avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
if (size == avio_rb24(s->pb) + 11) {
uint32_t ts = avio_rb24(s->pb);
ts |= avio_r8(s->pb) << 24;
ts |= (unsigned)avio_r8(s->pb) << 24;
if (ts)
s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
else if (fsize >= 8 && fsize - 8 >= size) {