gnu: libyaml: Fix CVE-2014-9130.

* gnu/packages/patches/libyaml-CVE-2014-9130.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/web.scm (libyaml): Use it.

gnu/local.mk

@@ -809,6 +809,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/xfce4-session-fix-xflock4.patch		\
   %D%/packages/patches/xfce4-settings-defaults.patch		\
   %D%/packages/patches/xmodmap-asprintf.patch 			\
+  %D%/packages/patches/libyaml-CVE-2014-9130.patch 		\
   %D%/packages/patches/zathura-plugindir-environment-variable.patch
 
 MISC_DISTRO_FILES =				\

gnu/packages/patches/libyaml-CVE-2014-9130.patch

@@ -0,0 +1,30 @@
+Fixes CVE-2014-9130
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9130
+
+Upstream source:
+https://bitbucket.org/xi/libyaml/commits/2b9156756423e967cfd09a61d125d883fca6f4f2
+
+# HG changeset patch
+# User Kirill Simonov <xi@resolvent.net>
+# Date 1417197312 21600
+# Node ID 2b9156756423e967cfd09a61d125d883fca6f4f2
+# Parent  053f53a381ff6adbbc93a31ab7fdee06a16c8a33
+Removed invalid simple key assertion (thank to Jonathan Gray).
+
+diff --git a/src/scanner.c b/src/scanner.c
+--- a/src/scanner.c
++++ b/src/scanner.c
+@@ -1106,13 +1106,6 @@
+             && parser->indent == (ptrdiff_t)parser->mark.column);
+ 
+     /*
+-     * A simple key is required only when it is the first token in the current
+-     * line.  Therefore it is always allowed.  But we add a check anyway.
+-     */
+-
+-    assert(parser->simple_key_allowed || !required);    /* Impossible. */
+-
+-    /*
+      * If the current position may start a simple key, save it.
+      */
+ 

gnu/packages/web.scm

@@ -611,6 +611,7 @@ of people.")
        (uri (string-append
              "http://pyyaml.org/download/libyaml/yaml-"
              version ".tar.gz"))
+       (patches (search-patches "libyaml-CVE-2014-9130.patch"))
        (sha256
         (base32
          "0j9731s5zjb8mjx7wzf6vh7bsqi38ay564x6s9nri2nh9cdrg9kx"))))