gnu: icu4c: Fix CVE-2017-14952.

* gnu/packages/patches/icu4c-CVE-2017-14952.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/icu4c.scm (icu4c)[replacement]: New field.
(icu4c-fixed): New variable.

gnu/local.mk

@@ -734,6 +734,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/hydra-disable-darcs-test.patch		\
   %D%/packages/patches/icecat-avoid-bundled-libraries.patch	\
   %D%/packages/patches/icu4c-CVE-2017-7867-CVE-2017-7868.patch	\
+  %D%/packages/patches/icu4c-CVE-2017-14952.patch		\
   %D%/packages/patches/icu4c-reset-keyword-list-iterator.patch	\
   %D%/packages/patches/id3lib-CVE-2007-4460.patch			\
   %D%/packages/patches/ilmbase-fix-tests.patch			\

gnu/packages/icu4c.scm

@@ -32,6 +32,7 @@ (define-module (gnu packages icu4c)
 (define-public icu4c
   (package
    (name "icu4c")
+   (replacement icu4c-fixed)
    (version "58.2")
    (source (origin
             (method url-fetch)
@@ -70,6 +71,15 @@ (define-public icu4c
    (license x11)
    (home-page "http://site.icu-project.org/")))
 
+(define icu4c-fixed
+  (package
+    (inherit icu4c)
+    (source (origin
+              (inherit (package-source icu4c))
+              (patches (append
+                         (origin-patches (package-source icu4c))
+                         (search-patches "icu4c-CVE-2017-14952.patch")))))))
+
 (define-public java-icu4j
   (package
     (name "java-icu4j")

gnu/packages/patches/icu4c-CVE-2017-14952.patch

@@ -0,0 +1,18 @@
+Fix CVE-2017-14952:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14952
+
+Patch copied from upstream source repository:
+
+http://bugs.icu-project.org/trac/changeset/40324/trunk/icu4c/source/i18n/zonemeta.cpp#file0
+
+Index: trunk/icu4c/source/i18n/zonemeta.cpp
+===================================================================
+--- icu/source/i18n/zonemeta.cpp	(revision 40283)
++++ icu/source/i18n/zonemeta.cpp	(revision 40324)
+@@ -691,5 +691,4 @@
+                     if (U_FAILURE(status)) {
+                         delete mzMappings;
+-                        deleteOlsonToMetaMappingEntry(entry);
+                         uprv_free(entry);
+                         break;