Make the copy of fontconfig font names before freeing their memory.

src/ports/SkFontConfigInterface_direct.cpp

 /*
  * Copyright 2009 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* migrated from chrome/src/skia/ext/SkFontHost_fontconfig_direct.cpp */
 
 #include <string>
@@ skipping 545 matching lines @@
             return true;
         }
     }
     return false;
 }
 
 SkDataTable* SkFontConfigInterfaceDirect::getFamilyNames() {
     SkAutoMutexAcquire ac(mutex_);
 
     FcPattern* pat = FcPatternCreate();
-    FcObjectSet* os = FcObjectSetBuild (FC_FAMILY, (char *) 0);
+    SkAutoTCallVProc<FcPattern, FcPatternDestroy> autoDestroyPat(pat);
+    if (NULL == pat) {
+        return NULL;
+    }
+
+    FcObjectSet* os = FcObjectSetBuild(FC_FAMILY, (char *)0);
+    SkAutoTCallVProc<FcObjectSet, FcObjectSetDestroy> autoDestroyOs(os);
     if (NULL == os) {
         return NULL;
     }
+
     FcFontSet* fs = FcFontList(NULL, pat, os);
+    SkAutoTCallVProc<FcFontSet, FcFontSetDestroy> autoDestroyFs(fs);
     if (NULL == fs) {
-        FcObjectSetDestroy(os);
         return NULL;
     }
 
     SkTDArray<const char*> names;
     SkTDArray<size_t> sizes;
     for (int i = 0; i < fs->nfont; ++i) {
         FcPattern* match = fs->fonts[i];
         const char* famName = get_name(match, FC_FAMILY);
         if (famName && !find_name(names, famName)) {
             *names.append() = famName;
             *sizes.append() = strlen(famName) + 1;
         }
     }
 
-    FcFontSetDestroy(fs);
-    FcObjectSetDestroy(os);
-    FcPatternDestroy(pat);
-
     return SkDataTable::NewCopyArrays((const void*const*)names.begin(),
                                       sizes.begin(), names.count());
 }
 
 bool SkFontConfigInterfaceDirect::matchFamilySet(const char inFamilyName[],
                                                  SkString* outFamilyName,
                                                  SkTArray<FontIdentity>* ids) {
     SkAutoMutexAcquire ac(mutex_);
 
 #if 0
@@ skipping 113 matching lines @@
                 *trimmedMatches.append() = match[i];
             }
         }
 
         SkFontStyleSet_FC* sset = SkNEW_ARGS(SkFontStyleSet_FC,
                                              (trimmedMatches.begin(),
                                               trimmedMatches.count()));
 #endif
     return false;
 }