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[FFmpeg-devel,1/2] avcodec/vc1_block: fix invalid shift in vc1_decode_p_mb()

Message ID 20190622122143.24908-1-michael@niedermayer.cc
State Accepted
Commit b153ba1c2e03d3148766a3ebf0e9c485197f30de
Headers show

Commit Message

Michael Niedermayer June 22, 2019, 12:21 p.m. UTC 
Fixes: left shift of negative value -5
Fixes: 15294/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5733921754447872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/vc1_block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c
index ec5339d2f0..7e41791832 100644
--- a/libavcodec/vc1_block.c
+++ b/libavcodec/vc1_block.c
@@ -1376,7 +1376,7 @@  static int vc1_decode_p_mb(VC1Context *v)
                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                     if (v->rangeredfrm)
                         for (j = 0; j < 64; j++)
-                            v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
+                            v->block[v->cur_blk_idx][block_map[i]][j] *= 2;
                     block_cbp   |= 0xF << (i << 2);
                     block_intra |= 1 << i;
                 } else if (val) {