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avcodec/cavsdec: Check alpha/beta offset

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Fixes: Integer overflow
Fixes: 6183/clusterfuzz-testcase-minimized-6269224436629504

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-20 23:11:01 +01:00
parent 4f8c691040
commit ae2eb04648
1 changed files with 5 additions and 0 deletions
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5
libavcodec/cavsdec.c
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@ -1067,6 +1067,11 @@ static int decode_pic(AVSContext *h)
if (!h->loop_filter_disable && get_bits1(&h->gb)) { if (!h->loop_filter_disable && get_bits1(&h->gb)) {
h->alpha_offset = get_se_golomb(&h->gb); h->alpha_offset = get_se_golomb(&h->gb);
h->beta_offset = get_se_golomb(&h->gb); h->beta_offset = get_se_golomb(&h->gb);
if ( h->alpha_offset < -64 || h->alpha_offset > 64
|| h-> beta_offset < -64 || h-> beta_offset > 64) {
h->alpha_offset = h->beta_offset = 0;
return AVERROR_INVALIDDATA;
}
} else { } else {
h->alpha_offset = h->beta_offset = 0; h->alpha_offset = h->beta_offset = 0;
} }