gnu: optipng: Fix CVE-2017-1000229.

* gnu/packages/image.scm (optipng)[source](patches): New field.
* gnu/packages/patches/optipng-CVE-2017-1000229.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -940,6 +940,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/openssl-runpath.patch			\
   %D%/packages/patches/openssl-1.1.0-c-rehash-in.patch		\
   %D%/packages/patches/openssl-c-rehash-in.patch		\
+  %D%/packages/patches/optipng-CVE-2017-1000229.patch		\
   %D%/packages/patches/orpheus-cast-errors-and-includes.patch	\
   %D%/packages/patches/osip-CVE-2017-7853.patch			\
   %D%/packages/patches/ots-no-include-missing-file.patch	\

gnu/packages/image.scm

@@ -1095,6 +1095,7 @@ installed as @code{stb_image}.")
        (method url-fetch)
        (uri (string-append "http://prdownloads.sourceforge.net/optipng/optipng-"
                            version ".tar.gz"))
+       (patches (search-patches "optipng-CVE-2017-1000229.patch"))
        (sha256
         (base32
          "105yk5qykvhiahzag67gm36s2kplxf6qn5hay02md0nkrcgn6w28"))))

gnu/packages/patches/optipng-CVE-2017-1000229.patch

@@ -0,0 +1,22 @@
+Fix CVE-2017-1000229:
+
+https://security-tracker.debian.org/tracker/CVE-2017-1000229
+https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-1000229.html
+https://nvd.nist.gov/vuln/detail/CVE-2017-1000229
+
+Patch copied from upstream bug tracker:
+https://sourceforge.net/p/optipng/bugs/65/
+
+diff --git a/src/minitiff/tiffread.c b/src/minitiff/tiffread.c
+index b4910ec..5f9b376 100644
+--- a/src/minitiff/tiffread.c
++++ b/src/minitiff/tiffread.c
+@@ -350,6 +350,8 @@ minitiff_read_info(struct minitiff_info *tiff_ptr, FILE *fp)
+         count = tiff_ptr->strip_offsets_count;
+         if (count == 0 || count > tiff_ptr->height)
+             goto err_invalid;
++        if (count > (size_t)-1 / sizeof(long))
++            goto err_memory;
+         tiff_ptr->strip_offsets = (long *)malloc(count * sizeof(long));
+         if (tiff_ptr->strip_offsets == NULL)
+             goto err_memory;