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| author | Michael Niedermayer <michaelni@gmx.at> | 2015-03-11 13:16:47 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-03-11 13:16:47 +0100 |
| commit | e5dfa4361955803ac10911a005803c1e514b6ca7 (patch) | |
| tree | bf17b3c4c2172129efcbb340649fdc16b95572b1 | |
| parent | 1932f7e2eee07e4a50e014a625dca79a9f9dba7a (diff) | |
| download | ffmpeg-e5dfa4361955803ac10911a005803c1e514b6ca7.tar.gz | |
avcodec/vc1_pred: Fix undefined shift in ff_vc1_pred_mv()
Found-by: Clang -fsanitize=shift
Reported-by: Thierry Foucu <tfoucu@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/vc1_pred.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/vc1_pred.c b/libavcodec/vc1_pred.c index f74992b70d..35c75abd83 100644 --- a/libavcodec/vc1_pred.c +++ b/libavcodec/vc1_pred.c @@ -231,8 +231,10 @@ void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y, else mixedmv_pic = 0; /* scale MV difference to be quad-pel */ - dmv_x <<= 1 - s->quarter_sample; - dmv_y <<= 1 - s->quarter_sample; + if (!s->quarter_sample) { + dmv_x *= 2; + dmv_y *= 2; + } wrap = s->b8_stride; xy = s->block_index[n]; |