gnu: libtiff: Fix CVE-2016-9448.

* gnu/packages/patches/libtiff-CVE-2016-9448.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/image.scm (libtiff/fixed)[source]: Use it.

gnu/local.mk

@@ -671,6 +671,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libtiff-CVE-2016-5652.patch		\
   %D%/packages/patches/libtiff-CVE-2016-9273.patch		\
   %D%/packages/patches/libtiff-CVE-2016-9297.patch		\
+  %D%/packages/patches/libtiff-CVE-2016-9448.patch		\
   %D%/packages/patches/libtiff-oob-accesses-in-decode.patch	\
   %D%/packages/patches/libtiff-oob-write-in-nextdecode.patch	\
   %D%/packages/patches/libtiff-uint32-overflow.patch		\

gnu/packages/image.scm

@@ -302,7 +302,8 @@ collection of tools for doing simple manipulations of TIFF images.")
                          "libtiff-CVE-2016-5323.patch"
                          "libtiff-CVE-2016-5652.patch"
                          "libtiff-CVE-2016-9273.patch"
-                         "libtiff-CVE-2016-9297.patch"))))))
+                         "libtiff-CVE-2016-9297.patch"
+                         "libtiff-CVE-2016-9448.patch"))))))
 
 (define-public libwmf
   (package

gnu/packages/patches/libtiff-CVE-2016-9448.patch

@@ -0,0 +1,34 @@
+Fix CVE-2016-9448 (regression caused by fix for CVE-2016-9297).
+
+http://bugzilla.maptools.org/show_bug.cgi?id=2593
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9448
+
+Patch copied from upstream source repository with:
+$ cvs diff -u -r 1.203 -r 1.204 libtiff/libtiff/tif_dirread.c
+
+Index: libtiff/libtiff/tif_dirread.c
+===================================================================
+RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dirread.c,v
+retrieving revision 1.203
+retrieving revision 1.204
+diff -u -r1.203 -r1.204
+--- libtiff/libtiff/tif_dirread.c	11 Nov 2016 20:22:01 -0000	1.203
++++ libtiff/libtiff/tif_dirread.c	16 Nov 2016 15:14:15 -0000	1.204
+@@ -5000,7 +5000,7 @@
+ 					if (err==TIFFReadDirEntryErrOk)
+ 					{
+ 						int m;
+-                        if( data[dp->tdir_count-1] != '\0' )
++                        if( dp->tdir_count > 0 && data[dp->tdir_count-1] != '\0' )
+                         {
+                             TIFFWarningExt(tif->tif_clientdata,module,"ASCII value for tag \"%s\" does not end in null byte. Forcing it to be null",fip->field_name);
+                             data[dp->tdir_count-1] = '\0';
+@@ -5177,7 +5177,7 @@
+ 				if (err==TIFFReadDirEntryErrOk)
+ 				{
+ 					int m;
+-                    if( data[dp->tdir_count-1] != '\0' )
++                    if( dp->tdir_count > 0 && data[dp->tdir_count-1] != '\0' )
+                     {
+                         TIFFWarningExt(tif->tif_clientdata,module,"ASCII value for tag \"%s\" does not end in null byte. Forcing it to be null",fip->field_name);
+                         data[dp->tdir_count-1] = '\0';