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avcodec/cllc: Check prefix

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Fixes: runtime error: left shift of 1610706944 by 1 places cannot be represented in type 'int'
Fixes: 1421/clusterfuzz-testcase-minimized-6239947507892224

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 62c5949beca2c95d6af5c74985467438d2295a66)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-09 19:38:46 +02:00
parent 5b809f53c2
commit b3e3cdc0fd
1 changed files with 4 additions and 0 deletions
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4
libavcodec/cllc.c
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@ -81,6 +81,10 @@ static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
count++;
}
if (prefix > (65535 - 256)/2) {
vlc->table = NULL;
return AVERROR_INVALIDDATA;
}
prefix <<= 1;
}