[SCM] libav/experimental: vp56: check buffer size to fix a potential segfault patch by Laurent Aimar fenrir _at_ videolan _dot_ org

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 68a4d3498f28eff3508595283074e1ed8493879d
Author: Laurent Aimar <fenrir at via.ecp.fr>
Date:   Thu Jan 28 23:49:46 2010 +0000

    vp56: check buffer size to fix a potential segfault
    patch by Laurent Aimar  fenrir _at_ videolan _dot_ org
    
    Originally committed as revision 21521 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c
index cbac71b..36027b4 100644
--- a/libavcodec/vp56.c
+++ b/libavcodec/vp56.c
@@ -504,8 +504,12 @@ int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     int is_alpha, av_uninit(alpha_offset);
 
     if (s->has_alpha) {
+        if (remaining_buf_size < 3)
+            return -1;
         alpha_offset = bytestream_get_be24(&buf);
         remaining_buf_size -= 3;
+        if (remaining_buf_size < alpha_offset)
+            return -1;
     }
 
     for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {

-- 
Libav/FFmpeg packaging