Avoid the possibility to read out-of-bounds of a static global array in Vorbis

patches/to_upstream/44_vorbis_oob_read.patch

Index: patches/to_upstream/44_vorbis_oob_read.patch
===================================================================
--- patches/to_upstream/44_vorbis_oob_read.patch	(revision 0)
+++ patches/to_upstream/44_vorbis_oob_read.patch	(revision 0)
@@ -0,0 +1,21 @@
+diff -wurp -N orig/libavcodec/vorbis.c patched-ffmpeg/libavcodec/vorbis.c
+--- orig/libavcodec/vorbis.c	2011-10-20 15:33:53.446580551 -0700
++++ patched-ffmpeg/libavcodec/vorbis.c	2011-10-20 15:34:15.605319551 -0700
+@@ -150,7 +150,7 @@ void ff_vorbis_ready_floor1_list(vorbis_
+     }
+ }
+ 
+-static inline void render_line_unrolled(intptr_t x, intptr_t y, int x1,
++static inline void render_line_unrolled(intptr_t x, unsigned char y, int x1,
+                                         intptr_t sy, int ady, int adx,
+                                         float *buf)
+ {
+@@ -185,7 +185,7 @@ static void render_line(int x0, int y0, 
+     } else {
+         int base = dy / adx;
+         int x    = x0;
+-        int y    = y0;
++        unsigned char y = y0;
+         int err  = -adx;
+         ady -= FFABS(base) * adx;
+         while (++x < x1) {