File ffmpeg-CVE-2020-22027.patch of Package ffmpeg

commit e787f8fd7ee99ba0c3e0f086ce2ce59eea7ed86c (HEAD, CVE-2020-22027_20191011_e787f8fd7ee99ba0c3e0f086ce2ce59eea7ed86c)
Author: Paul B Mahol <onemda@gmail.com>
Date:   Fri Oct 11 11:18:10 2019 +0200

    avfilter/vf_neighbor: check if width is 1
    
    Fixes #8242

--- ffmpeg-3.4.2/libavfilter/vf_neighbor.c
+++ ffmpeg-3.4.2_new/libavfilter/vf_neighbor.c
@@ -189,9 +189,11 @@
                                                    src + width - 2,                                              src + width - 1,
                                                    src + width - 2 + ph * stride, src + width - 1 + ph * stride, src + width - 1 + ph * stride};
 
-                s->filter(dst,             src,             1,         threshold, coordinateslb, s->coordinates);
-                s->filter(dst         + 1, src         + 1, width - 2, threshold, coordinates,   s->coordinates);
-                s->filter(dst + width - 1, src + width - 1, 1,         threshold, coordinatesrb, s->coordinates);
+                s->filter(dst,                 src,             1,         threshold, coordinateslb, s->coordinates);
+                if (width > 1) {
+                    s->filter(dst         + 1, src         + 1, width - 2, threshold, coordinates,   s->coordinates);
+                    s->filter(dst + width - 1, src + width - 1, 1,         threshold, coordinatesrb, s->coordinates);
+                }
 
                 src += stride;
                 dst += dstride;