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avcodec/diracdec: Check weight_log2denom

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Fixes: runtime error: shift exponent -1 is negative
Fixes: 2742/clusterfuzz-testcase-minimized-5724322402402304
Fixes: 2744/clusterfuzz-testcase-minimized-4672435653705728
Fixes: 2749/clusterfuzz-testcase-minimized-5298741273690112

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 880f5c5913)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-29 15:46:50 +02:00
parent 5987b16f86
commit 892ceb512f
1 changed files with 5 additions and 0 deletions
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5
libavcodec/diracdec.c
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@ -1173,6 +1173,11 @@ static int dirac_unpack_prediction_parameters(DiracContext *s)
if (get_bits1(gb)) {
s->weight_log2denom = get_interleaved_ue_golomb(gb);
if (s->weight_log2denom < 1 || s->weight_log2denom > 8) {
av_log(s->avctx, AV_LOG_ERROR, "weight_log2denom unsupported or invalid\n");
s->weight_log2denom = 1;
return AVERROR_INVALIDDATA;
}
s->weight[0] = dirac_get_se_golomb(gb);
if (s->num_refs == 2)
s->weight[1] = dirac_get_se_golomb(gb);