diff -Naur tiff-4.0.1.orig/ChangeLog tiff-4.0.1/ChangeLog
--- tiff-4.0.1.orig/ChangeLog	2012-02-18 17:02:33.000000000 -0500
+++ tiff-4.0.1/ChangeLog	2012-05-04 23:33:20.665334408 -0400
@@ -1,3 +1,8 @@
+2012-03-30  Frank Warmerdam  <warmerdam@google.com>
+
+	* tif_getimage.c: Fix size overflow (zdi-can-1221,CVE-2012-1173)
+	care of Tom Lane @ Red Hat.
+
 2012-02-18  Bob Friesenhahn  <bfriesen@simple.dallas.tx.us>
 
 	* libtiff 4.0.1 released.
diff -Naur tiff-4.0.1.orig/libtiff/tif_getimage.c tiff-4.0.1/libtiff/tif_getimage.c
--- tiff-4.0.1.orig/libtiff/tif_getimage.c	2011-02-24 22:34:02.000000000 -0500
+++ tiff-4.0.1/libtiff/tif_getimage.c	2012-05-04 23:33:20.666334244 -0400
@@ -1,4 +1,4 @@
-/* $Id: tif_getimage.c,v 1.78 2011-02-23 21:46:09 fwarmerdam Exp $ */
+/* $Id: tif_getimage.c,v 1.79 2012-04-06 16:46:46 fwarmerdam Exp $ */
 
 /*
  * Copyright (c) 1991-1997 Sam Leffler
@@ -692,6 +692,7 @@
 	unsigned char* p2;
 	unsigned char* pa;
 	tmsize_t tilesize;
+	tmsize_t bufsize;
 	int32 fromskew, toskew;
 	int alpha = img->alpha;
 	uint32 nrow;
@@ -699,12 +700,17 @@
         int colorchannels;
 
 	tilesize = TIFFTileSize(tif);  
-	buf = (unsigned char*) _TIFFmalloc((alpha?4:3)*tilesize);
+	bufsize = TIFFSafeMultiply(tmsize_t,alpha?4:3,tilesize);
+	if (bufsize == 0) {
+		TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "Integer overflow in %s", "gtTileSeparate");
+		return (0);
+	}
+	buf = (unsigned char*) _TIFFmalloc(bufsize);
 	if (buf == 0) {
 		TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "%s", "No space for tile buffer");
 		return (0);
 	}
-	_TIFFmemset(buf, 0, (alpha?4:3)*tilesize);
+	_TIFFmemset(buf, 0, bufsize);
 	p0 = buf;
 	p1 = p0 + tilesize;
 	p2 = p1 + tilesize;
@@ -917,17 +923,23 @@
 	uint32 rowsperstrip, offset_row;
 	uint32 imagewidth = img->width;
 	tmsize_t stripsize;
+	tmsize_t bufsize;
 	int32 fromskew, toskew;
 	int alpha = img->alpha;
 	int ret = 1, flip, colorchannels;
 
 	stripsize = TIFFStripSize(tif);  
-	p0 = buf = (unsigned char *)_TIFFmalloc((alpha?4:3)*stripsize);
+	bufsize = TIFFSafeMultiply(tmsize_t,alpha?4:3,stripsize);
+	if (bufsize == 0) {
+		TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "Integer overflow in %s", "gtStripSeparate");
+		return (0);
+	}
+	p0 = buf = (unsigned char *)_TIFFmalloc(bufsize);
 	if (buf == 0) {
 		TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "No space for tile buffer");
 		return (0);
 	}
-	_TIFFmemset(buf, 0, (alpha?4:3)*stripsize);
+	_TIFFmemset(buf, 0, bufsize);
 	p1 = p0 + stripsize;
 	p2 = p1 + stripsize;
 	pa = (alpha?(p2+stripsize):NULL);
diff -Naur tiff-4.0.1.orig/libtiff/tiffiop.h tiff-4.0.1/libtiff/tiffiop.h
--- tiff-4.0.1.orig/libtiff/tiffiop.h	2011-02-19 11:26:09.000000000 -0500
+++ tiff-4.0.1/libtiff/tiffiop.h	2012-05-04 23:33:20.667334085 -0400
@@ -1,4 +1,4 @@
-/* $Id: tiffiop.h,v 1.82 2011-02-18 20:53:05 fwarmerdam Exp $ */
+/* $Id: tiffiop.h,v 1.83 2012-04-06 16:46:47 fwarmerdam Exp $ */
 
 /*
  * Copyright (c) 1988-1997 Sam Leffler
@@ -250,7 +250,7 @@
 #define TIFFroundup_64(x, y) (TIFFhowmany_64(x,y)*(y))
 
 /* Safe multiply which returns zero if there is an integer overflow */
-#define TIFFSafeMultiply(t,v,m) ((((t)m != (t)0) && (((t)((v*m)/m)) == (t)v)) ? (t)(v*m) : (t)0)
+#define TIFFSafeMultiply(t,v,m) ((((t)(m) != (t)0) && (((t)(((v)*(m))/(m))) == (t)(v))) ? (t)((v)*(m)) : (t)0)
 
 #define TIFFmax(A,B) ((A)>(B)?(A):(B))
 #define TIFFmin(A,B) ((A)<(B)?(A):(B))