Turn ancient V offset numerical constants into named ones.

Add a check that checks that the width is within the choosen constant.
This might have been exploitable.

Originally committed as revision 26165 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

1 files changed, 4 insertions, 1 deletions

diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index aa583a6b1b..81b2f1afb9 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -31,6 +31,9 @@
 
 #define MAX_FILTER_SIZE 256
 
+#define VOF  4096
+#define VOFW 2048
+
 typedef int (*SwsFunc)(struct SwsContext *context, uint8_t* src[], int srcStride[], int srcSliceY,
              int srcSliceH, uint8_t* dst[], int dstStride[]);
 
@@ -70,7 +73,7 @@ typedef struct SwsContext{
     int16_t *vChrFilter;
     int16_t *vChrFilterPos;
 
-    uint8_t formatConvBuffer[4000]; //FIXME dynamic alloc, but we have to change a lot of code for this to be useful
+    uint8_t formatConvBuffer[VOF]; //FIXME dynamic alloc, but we have to change a lot of code for this to be useful
 
     int hLumFilterSize;
     int hChrFilterSize;