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avcodec/diracdec: Check numx/y 

Fixes division by 0
Fixes: 60261c4469ba3e11059890fb2832a515/asan_generic_135e694_2790_beb94eaa0aeb7d11c0437375a8964a99.drc

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-08-20 19:21:07 +02:00
parent 27ee70290e
commit a31e08fa1a
1 changed files with 5 additions and 0 deletions
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5
libavcodec/diracdec.c
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@ -1225,6 +1225,11 @@ static int dirac_unpack_idwt_params(DiracContext *s)
else {
s->num_x = get_interleaved_ue_golomb(gb);
s->num_y = get_interleaved_ue_golomb(gb);
if (s->num_x * s->num_y == 0 || s->num_x * (uint64_t)s->num_y > INT_MAX) {
av_log(s->avctx,AV_LOG_ERROR,"Invalid numx/y\n");
s->num_x = s->num_y = 0;
return AVERROR_INVALIDDATA;
}
if (s->ld_picture) {
s->lowdelay.bytes.num = get_interleaved_ue_golomb(gb);
s->lowdelay.bytes.den = get_interleaved_ue_golomb(gb);