--- libtiff/tif_getimage.c.orig 2012-04-19 08:49:47.367361776 +0100
+++ libtiff/tif_getimage.c 2012-04-19 09:42:41.967552598 +0100
@@ -673,18 +673,24 @@
unsigned char* p2;
unsigned char* pa;
tsize_t tilesize;
+ tsize_t bufsize;
int32 fromskew, toskew;
int alpha = img->alpha;
uint32 nrow;
int ret = 1, flip;
tilesize = TIFFTileSize(tif);
- buf = (unsigned char*) _TIFFmalloc((alpha?4:3)*tilesize);
+ bufsize = TIFFSafeMultiply(tsize_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), "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;
@@ -880,17 +886,23 @@
uint32 rowsperstrip, offset_row;
uint32 imagewidth = img->width;
tsize_t stripsize;
+ tsize_t bufsize;
int32 fromskew, toskew;
int alpha = img->alpha;
int ret = 1, flip;
stripsize = TIFFStripSize(tif);
- p0 = buf = (unsigned char *)_TIFFmalloc((alpha?4:3)*stripsize);
+ bufsize = TIFFSafeMultiply(tsize_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);
--- libtiff/tiffiop.h.orig 2012-04-19 08:50:17.752392827 +0100
+++ libtiff/tiffiop.h 2012-04-19 08:50:51.586979922 +0100
@@ -246,7 +246,7 @@
#define TIFFroundup(x, y) (TIFFhowmany(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))