From a1f6ffd44d115e9ccc4e1acb2219e7d8bf6c0d58 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Reimar=20D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
Date: Sun, 29 Mar 2009 17:50:46 +0000
Subject: [PATCH] Change CHECK_STREAM_PTR macro to correctly handle the
 (extremely unlikely) overflow case.

Originally committed as revision 18224 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/interplayvideo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c
index 529c3193ef..2fcc911967 100644
--- a/libavcodec/interplayvideo.c
+++ b/libavcodec/interplayvideo.c
@@ -76,7 +76,7 @@ typedef struct IpvideoContext {
 } IpvideoContext;
 
 #define CHECK_STREAM_PTR(n) \
-  if ((s->stream_ptr + n) > s->stream_end) { \
+  if (s->stream_end - s->stream_ptr < n) { \
     av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
       s->stream_ptr + n, s->stream_end); \
     return -1; \