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avcodec/mss3: Check for the rac stream being invalid in rac_normalize()

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Fixes: out of array read
Fixes: 15982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSA1_fuzzer-5630676251967488

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 99a172f3f4d0bef024c6293f575caaaddce0b267)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-04 09:33:45 +02:00
parent 889fdc690a
commit 8b8f5fd05e
1 changed files with 4 additions and 0 deletions
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4
libavcodec/mss3.c
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@ -298,6 +298,10 @@ static void rac_normalise(RangeCoder *c)
c->got_error = 1; c->got_error = 1;
c->low = 1; c->low = 1;
} }
if (c->low > c->range) {
c->got_error = 1;
c->low = 1;
}
if (c->range >= RAC_BOTTOM) if (c->range >= RAC_BOTTOM)
return; return;
} }