avfilter/vf_cover_rect: Handle the case where the cover rectangle is as large as the input

Fixes division by 0
Fixes CID1297575

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavfilter/vf_cover_rect.c b/libavfilter/vf_cover_rect.c
index d12807ad53..c2020bb392 100644
--- a/libavfilter/vf_cover_rect.c
+++ b/libavfilter/vf_cover_rect.c
@@ -132,7 +132,7 @@ static void blur(CoverContext *cover, AVFrame *in, int offx, int offy)
                     s += data[x + h*stride] * scale;
                     c += scale;
                 }
-                data[x + y*stride] = (s + (c>>1)) / c;
+                data[x + y*stride] = c ? (s + (c>>1)) / c : 0;
             }
         }
     }