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This patch is submitted to upstream for CVE-2012-1173
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diff -Naur tiff-3.9.5.orig/libtiff/tif_getimage.c tiff-3.9.5/libtiff/tif_getimage.c
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--- tiff-3.9.5.orig/libtiff/tif_getimage.c 2010-07-08 12:17:59.000000000 -0400
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+++ tiff-3.9.5/libtiff/tif_getimage.c 2012-03-14 14:49:25.796728783 -0400
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@@ -673,18 +673,24 @@
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unsigned char* p2;
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unsigned char* pa;
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tsize_t tilesize;
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+ tsize_t bufsize;
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int32 fromskew, toskew;
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int alpha = img->alpha;
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uint32 nrow;
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int ret = 1, flip;
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tilesize = TIFFTileSize(tif);
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- buf = (unsigned char*) _TIFFmalloc((alpha?4:3)*tilesize);
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+ bufsize = TIFFSafeMultiply(tsize_t,alpha?4:3,tilesize);
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+ if (bufsize == 0) {
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+ TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "Integer overflow in %s", "gtTileSeparate");
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+ return (0);
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+ }
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+ buf = (unsigned char*) _TIFFmalloc(bufsize);
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if (buf == 0) {
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TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "No space for tile buffer");
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return (0);
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}
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- _TIFFmemset(buf, 0, (alpha?4:3)*tilesize);
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+ _TIFFmemset(buf, 0, bufsize);
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p0 = buf;
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p1 = p0 + tilesize;
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p2 = p1 + tilesize;
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@@ -880,17 +886,23 @@
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uint32 rowsperstrip, offset_row;
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uint32 imagewidth = img->width;
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tsize_t stripsize;
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+ tsize_t bufsize;
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int32 fromskew, toskew;
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int alpha = img->alpha;
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int ret = 1, flip;
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stripsize = TIFFStripSize(tif);
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- p0 = buf = (unsigned char *)_TIFFmalloc((alpha?4:3)*stripsize);
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+ bufsize = TIFFSafeMultiply(tsize_t,alpha?4:3,stripsize);
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+ if (bufsize == 0) {
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+ TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "Integer overflow in %s", "gtStripSeparate");
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+ return (0);
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+ }
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+ p0 = buf = (unsigned char *)_TIFFmalloc(bufsize);
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if (buf == 0) {
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TIFFErrorExt(tif->tif_clientdata, TIFFFileName(tif), "No space for tile buffer");
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return (0);
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}
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- _TIFFmemset(buf, 0, (alpha?4:3)*stripsize);
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+ _TIFFmemset(buf, 0, bufsize);
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p1 = p0 + stripsize;
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p2 = p1 + stripsize;
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pa = (alpha?(p2+stripsize):NULL);
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diff -Naur tiff-3.9.5.orig/libtiff/tiffiop.h tiff-3.9.5/libtiff/tiffiop.h
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--- tiff-3.9.5.orig/libtiff/tiffiop.h 2011-03-28 09:43:43.000000000 -0400
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+++ tiff-3.9.5/libtiff/tiffiop.h 2012-03-14 14:49:25.797728754 -0400
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@@ -246,7 +246,7 @@
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#define TIFFroundup(x, y) (TIFFhowmany(x,y)*(y))
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/* Safe multiply which returns zero if there is an integer overflow */
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-#define TIFFSafeMultiply(t,v,m) ((((t)m != (t)0) && (((t)((v*m)/m)) == (t)v)) ? (t)(v*m) : (t)0)
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+#define TIFFSafeMultiply(t,v,m) ((((t)(m) != (t)0) && (((t)(((v)*(m))/(m))) == (t)(v))) ? (t)((v)*(m)) : (t)0)
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#define TIFFmax(A,B) ((A)>(B)?(A):(B))
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#define TIFFmin(A,B) ((A)<(B)?(A):(B))
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