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vcodec/agm: Alloc based on coded dimensions 

Fixes: out of array read
Fixes: 18715/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5659333417500672

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-14 15:10:28 +01:00
parent 73ee53f317
commit bfa8272f40
1 changed files with 1 additions and 1 deletions
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libavcodec/agm.c
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@ -827,7 +827,7 @@ static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame
static int decode_motion_vectors(AVCodecContext *avctx, GetBitContext *gb)
{
AGMContext *s = avctx->priv_data;
int nb_mvs = ((avctx->height + 15) >> 4) * ((avctx->width + 15) >> 4);
int nb_mvs = ((avctx->coded_height + 15) >> 4) * ((avctx->coded_width + 15) >> 4);
int ret, skip = 0, value, map;
av_fast_padded_malloc(&s->mvectors, &s->mvectors_size,