[FFmpeg-cvslog] avcodec/dvdec: Use av_clip_uint8 instead of ff_crop_tab

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov 16 00:10:53 2019 +0100| [d73f06270600c37c74beeceac37f593838ced383] | committer: Michael Niedermayer

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 at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d73f06270600c37c74beeceac37f593838ced383
---

 libavcodec/dvdec.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavcodec/dvdec.c b/libavcodec/dvdec.c
index 578d7f505f..c526091eb4 100644
--- a/libavcodec/dvdec.c
+++ b/libavcodec/dvdec.c
@@ -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;
     }