gnu: libtiff: Fix two integer overflows.

* gnu/packages/patches/libtiff-tiffycbcrtorgb-integer-overflow.patch,
gnu/packages/patches/libtiff-tiffycbcrtorgbinit-integer-overflow.patch:
New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/image.scm (libtiff-4.0.8)[source]: Use them.

gnu/local.mk

@@ -783,6 +783,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/libtiff-null-dereference.patch		\
   %D%/packages/patches/libtiff-tiffcp-underflow.patch		\
   %D%/packages/patches/libtiff-tiffgetfield-bugs.patch		\
+  %D%/packages/patches/libtiff-tiffycbcrtorgb-integer-overflow.patch	\
+  %D%/packages/patches/libtiff-tiffycbcrtorgbinit-integer-overflow.patch	\
   %D%/packages/patches/libtirpc-CVE-2017-8779.patch		\
   %D%/packages/patches/libtorrent-rasterbar-boost-compat.patch	\
   %D%/packages/patches/libtool-skip-tests2.patch		\

gnu/packages/image.scm

@@ -393,7 +393,9 @@ collection of tools for doing simple manipulations of TIFF images.")
                            version ".tar.gz"))
        (patches (search-patches "libtiff-tiffgetfield-bugs.patch"
                                 "libtiff-CVE-2016-10688.patch"
-                                "libtiff-CVE-2017-9936.patch"))
+                                "libtiff-CVE-2017-9936.patch"
+                                "libtiff-tiffycbcrtorgb-integer-overflow.patch"
+                                "libtiff-tiffycbcrtorgbinit-integer-overflow.patch"))
        (sha256
         (base32
          "0419mh6kkhz5fkyl77gv0in8x4d2jpdpfs147y8mj86rrjlabmsr"))))))

gnu/packages/patches/libtiff-tiffycbcrtorgb-integer-overflow.patch

@@ -0,0 +1,57 @@
+Fix an integer overflow TIFFYCbCrtoRGB():
+
+https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1844
+
+3rd party Git reference:
+
+https://github.com/vadz/libtiff/commit/02669064e927074819ce1ed39aba0fccaa167717
+
+2017-05-29  Even Rouault <even.rouault at spatialys.com>
+
+        * libtiff/tif_color.c: TIFFYCbCrToRGBInit(): stricter clamping to avoid
+        int32 overflow in TIFFYCbCrtoRGB().
+        Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1844
+        Credit to OSS Fuzz
+
+
+/cvs/maptools/cvsroot/libtiff/ChangeLog,v  <--  ChangeLog
+new revision: 1.1241; previous revision: 1.1240
+/cvs/maptools/cvsroot/libtiff/libtiff/tif_color.c,v  <--  libtiff/tif_color.c
+new revision: 1.24; previous revision: 1.23
+
+Index: libtiff/libtiff/tif_color.c
+===================================================================
+RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_color.c,v
+retrieving revision 1.23
+retrieving revision 1.24
+diff -u -r1.23 -r1.24
+--- libtiff/libtiff/tif_color.c	13 May 2017 18:17:34 -0000	1.23
++++ libtiff/libtiff/tif_color.c	29 May 2017 10:12:54 -0000	1.24
+@@ -1,4 +1,4 @@
+-/* $Id: tif_color.c,v 1.23 2017-05-13 18:17:34 erouault Exp $ */
++/* $Id: tif_color.c,v 1.24 2017-05-29 10:12:54 erouault Exp $ */
+ 
+ /*
+  * Copyright (c) 1988-1997 Sam Leffler
+@@ -275,10 +275,10 @@
+       for (i = 0, x = -128; i < 256; i++, x++) {
+ 	    int32 Cr = (int32)CLAMPw(Code2V(x, refBlackWhite[4] - 128.0F,
+ 			    refBlackWhite[5] - 128.0F, 127),
+-                            -128.0F * 64, 128.0F * 64);
++                            -128.0F * 32, 128.0F * 32);
+ 	    int32 Cb = (int32)CLAMPw(Code2V(x, refBlackWhite[2] - 128.0F,
+ 			    refBlackWhite[3] - 128.0F, 127),
+-                            -128.0F * 64, 128.0F * 64);
++                            -128.0F * 32, 128.0F * 32);
+ 
+ 	    ycbcr->Cr_r_tab[i] = (int32)((D1*Cr + ONE_HALF)>>SHIFT);
+ 	    ycbcr->Cb_b_tab[i] = (int32)((D3*Cb + ONE_HALF)>>SHIFT);
+@@ -286,7 +286,7 @@
+ 	    ycbcr->Cb_g_tab[i] = D4*Cb + ONE_HALF;
+ 	    ycbcr->Y_tab[i] =
+ 		    (int32)CLAMPw(Code2V(x + 128, refBlackWhite[0], refBlackWhite[1], 255),
+-                                  -128.0F * 64, 128.0F * 64);
++                                  -128.0F * 32, 128.0F * 32);
+       }
+     }
+ 

gnu/packages/patches/libtiff-tiffycbcrtorgbinit-integer-overflow.patch

@@ -0,0 +1,43 @@
+Fix an integer overflow in initYCbCrConversion():
+
+https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1907
+
+3rd party Git reference
+
+https://github.com/vadz/libtiff/commit/468988860e0dae62ebbf991627c74bcbb4bd256f
+
+        * libtiff/tif_getimage.c: initYCbCrConversion(): stricter validation for
+        refBlackWhite coefficients values. To avoid invalid float->int32 conversion
+        (when refBlackWhite[0] == 2147483648.f)
+        Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1907
+        Credit to OSS Fuzz
+
+
+/cvs/maptools/cvsroot/libtiff/ChangeLog,v  <--  ChangeLog
+new revision: 1.1243; previous revision: 1.1242
+/cvs/maptools/cvsroot/libtiff/libtiff/tif_getimage.c,v  <--  libtiff/tif_getimage.c
+new revision: 1.107; previous revision: 1.106
+
+Index: libtiff/libtiff/tif_getimage.c
+===================================================================
+RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_getimage.c,v
+retrieving revision 1.106
+retrieving revision 1.107
+diff -u -r1.106 -r1.107
+--- libtiff/libtiff/tif_getimage.c	20 May 2017 11:29:02 -0000	1.106
++++ libtiff/libtiff/tif_getimage.c	29 May 2017 11:29:06 -0000	1.107
+@@ -1,4 +1,4 @@
+-/* $Id: tif_getimage.c,v 1.106 2017-05-20 11:29:02 erouault Exp $ */
++/* $Id: tif_getimage.c,v 1.107 2017-05-29 11:29:06 erouault Exp $ */
+ 
+ /*
+  * Copyright (c) 1991-1997 Sam Leffler
+@@ -2241,7 +2241,7 @@
+ 
+ static int isInRefBlackWhiteRange(float f)
+ {
+-    return f >= (float)(-0x7FFFFFFF + 128) && f <= (float)0x7FFFFFFF;
++    return f > (float)(-0x7FFFFFFF + 128) && f < (float)0x7FFFFFFF;
+ }
+ 
+ static int