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avcodec/dvdec: Use av_clip_uint8 instead of ff_crop_tab 

Fixes: out of array access
Fixes: 18788/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DVVIDEO_fuzzer-6254863113781248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Baptiste Coudurier <baptiste.coudurier@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-16 00:10:53 +01:00
parent fdf46b4a6b
commit d73f062706
1 changed files with 1 additions and 2 deletions
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3
libavcodec/dvdec.c
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@ -272,11 +272,10 @@ static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
static av_always_inline void put_block_8x4(int16_t *block, uint8_t *av_restrict p, int stride)
{
int i, j;
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
for (i = 0; i < 4; i++) {
for (j = 0; j < 8; j++)
p[j] = cm[block[j]];
p[j] = av_clip_uint8(block[j]);
block += 8;
p += stride;
}