avcodec/h264_direct: Fix runtime error: left shift of negative value -14
authorMichael Niedermayer <michael@niedermayer.cc>
Tue, 28 Feb 2017 02:13:24 +0000 (03:13 +0100)
committerMichael Niedermayer <michael@niedermayer.cc>
Wed, 1 Mar 2017 13:07:33 +0000 (14:07 +0100)
Fixes: 682/clusterfuzz-testcase-4799120021651456

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/h264_direct.c

index 107c905..cbb8466 100644 (file)
@@ -614,7 +614,7 @@ single_col:
 
                 {
                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * b4_stride];
-                    int my_col            = (mv_col[1] << y_shift) / 2;
+                    int my_col            = (mv_col[1] * (1 << y_shift)) / 2;
                     int mx                = (scale * mv_col[0] + 128) >> 8;
                     int my                = (scale * my_col    + 128) >> 8;
                     fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8,