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avcodec/mv30: Do not allow MVs outside the allocated image

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Fixes: out of array read
Fixes: 21804/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MV30_fuzzer-5673678898724864

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 2020-05-20 21:52:23 +02:00
parent c42ed06695
commit e73a251680
1 changed files with 2 additions and 2 deletions
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4
libavcodec/mv30.c
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@ -545,8 +545,8 @@ static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
int px = x + mv_x;
int py = y + mv_y;
if (px < 0 || px >= avctx->width ||
py < 0 || py >= avctx->height)
if (px < 0 || px > FFALIGN(avctx->width , 16) - 16 ||
py < 0 || py > FFALIGN(avctx->height, 16) - 16)
return AVERROR_INVALIDDATA;
src[0] = prev->data[0] + in_linesize[0] * py + px;