gnu: icu4c: Fix crashes in programs using system ICU.

Fixes <http://bugs.gnu.org/26462>.

* gnu/packages/patches/icu4c-reset-keyword-list-iterator.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

@@ -658,6 +658,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/icu4c-CVE-2014-6585.patch		\
   %D%/packages/patches/icu4c-CVE-2015-1270.patch		\
   %D%/packages/patches/icu4c-CVE-2015-4760.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			\
   %D%/packages/patches/isl-0.11.1-aarch64-support.patch	\

gnu/packages/icu4c.scm

@@ -2,6 +2,7 @@
 ;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2015, 2016 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -30,6 +31,7 @@
   (package
    (name "icu4c")
    (version "58.2")
+   (replacement icu4c/fixed)
    (source (origin
             (method url-fetch)
             (uri (string-append
@@ -63,3 +65,12 @@ globalisation support for software applications.  This package contains the
 C/C++ part.")
    (license x11)
    (home-page "http://site.icu-project.org/")))
+
+(define icu4c/fixed
+  (package
+    (inherit icu4c)
+    (replacement #f)
+    (source (origin
+              (inherit (package-source icu4c))
+              (patches
+               (search-patches "icu4c-reset-keyword-list-iterator.patch"))))))

gnu/packages/patches/icu4c-reset-keyword-list-iterator.patch

@@ -0,0 +1,130 @@
+Copied from upstream: http://bugs.icu-project.org/trac/changeset/39484/.
+
+Fixes <http://bugs.gnu.org/26462> (crashes).
+
+Paths and line endings have been adapted.
+
+Index: icu/source/common/ulist.c
+===================================================================
+--- icu/source/common/ulist.c	(revision 39483)
++++ icu/source/common/ulist.c	(revision 39484)
+@@ -30,5 +30,4 @@
+     
+     int32_t size;
+-    int32_t currentIndex;
+ };
+ 
+@@ -52,5 +51,4 @@
+     newList->tail = NULL;
+     newList->size = 0;
+-    newList->currentIndex = -1;
+     
+     return newList;
+@@ -81,6 +79,7 @@
+         p->next->previous = p->previous;
+     }
+-    list->curr = NULL;
+-    list->currentIndex = 0;
++    if (p == list->curr) {
++        list->curr = p->next;
++    }
+     --list->size;
+     if (p->forceDelete) {
+@@ -151,5 +150,4 @@
+         list->head->previous = newItem;
+         list->head = newItem;
+-        list->currentIndex++;
+     }
+     
+@@ -194,5 +192,4 @@
+     curr = list->curr;
+     list->curr = curr->next;
+-    list->currentIndex++;
+     
+     return curr->data;
+@@ -210,5 +207,4 @@
+     if (list != NULL) {
+         list->curr = list->head;
+-        list->currentIndex = 0;
+     }
+ }
+@@ -273,3 +269,2 @@
+     return (UList *)(en->context);
+ }
+-
+Index: icu/source/i18n/ucol_res.cpp
+===================================================================
+--- icu/source/i18n/ucol_res.cpp	(revision 39483)
++++ icu/source/i18n/ucol_res.cpp	(revision 39484)
+@@ -681,4 +681,5 @@
+     }
+     memcpy(en, &defaultKeywordValues, sizeof(UEnumeration));
++    ulist_resetList(sink.values);  // Initialize the iterator.
+     en->context = sink.values;
+     sink.values = NULL;  // Avoid deletion in the sink destructor.
+Index: icu/source/test/intltest/apicoll.cpp
+===================================================================
+--- icu/source/test/intltest/apicoll.cpp	(revision 39483)
++++ icu/source/test/intltest/apicoll.cpp	(revision 39484)
+@@ -82,14 +82,7 @@
+     col = Collator::createInstance(Locale::getEnglish(), success);
+     if (U_FAILURE(success)){
+-        errcheckln(success, "Default Collator creation failed. - %s", u_errorName(success));
+-        return;
+-    }
+-
+-    StringEnumeration* kwEnum = col->getKeywordValuesForLocale("", Locale::getEnglish(),true,success);
+-    if (U_FAILURE(success)){
+-        errcheckln(success, "Get Keyword Values for Locale failed. - %s", u_errorName(success));
+-        return;
+-    }
+-    delete kwEnum;
++        errcheckln(success, "English Collator creation failed. - %s", u_errorName(success));
++        return;
++    }
+ 
+     col->getVersion(versionArray);
+@@ -230,4 +223,27 @@
+     delete aFrCol;
+     delete junk;
++}
++
++void CollationAPITest::TestKeywordValues() {
++    IcuTestErrorCode errorCode(*this, "TestKeywordValues");
++    LocalPointer<Collator> col(Collator::createInstance(Locale::getEnglish(), errorCode));
++    if (errorCode.logIfFailureAndReset("English Collator creation failed")) {
++        return;
++    }
++
++    LocalPointer<StringEnumeration> kwEnum(
++        col->getKeywordValuesForLocale("collation", Locale::getEnglish(), TRUE, errorCode));
++    if (errorCode.logIfFailureAndReset("Get Keyword Values for English Collator failed")) {
++        return;
++    }
++    assertTrue("expect at least one collation tailoring for English", kwEnum->count(errorCode) > 0);
++    const char *kw;
++    UBool hasStandard = FALSE;
++    while ((kw = kwEnum->next(NULL, errorCode)) != NULL) {
++        if (strcmp(kw, "standard") == 0) {
++            hasStandard = TRUE;
++        }
++    }
++    assertTrue("expect at least the 'standard' collation tailoring for English", hasStandard);
+ }
+ 
+@@ -2467,4 +2483,5 @@
+     TESTCASE_AUTO_BEGIN;
+     TESTCASE_AUTO(TestProperty);
++    TESTCASE_AUTO(TestKeywordValues);
+     TESTCASE_AUTO(TestOperators);
+     TESTCASE_AUTO(TestDuplicate);
+Index: icu/source/test/intltest/apicoll.h
+===================================================================
+--- icu/source/test/intltest/apicoll.h	(revision 39483)
++++ icu/source/test/intltest/apicoll.h	(revision 39484)
+@@ -36,4 +36,5 @@
+      */
+     void TestProperty(/* char* par */);
++    void TestKeywordValues();
+ 
+     /**