Check for NULL familyName in SkFontMgr_fontconfig.

src/ports/SkFontMgr_fontconfig.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDataTable.h"
 #include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
@@ skipping 753 matching lines @@
 
     virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
                                                     const SkFontStyle& style,
                                                     const char* bcp47[],
                                                     int bcp47Count,
                                                     SkUnichar character) const override
     {
         FCLocker lock;
 
         SkAutoFcPattern pattern;
-        FcValue familyNameValue;
-        familyNameValue.type = FcTypeString;
-        familyNameValue.u.s = reinterpret_cast<const FcChar8*>(familyName);
-        FcPatternAddWeak(pattern, FC_FAMILY, familyNameValue, FcFalse);
+        if (familyName) {
+            FcValue familyNameValue;
+            familyNameValue.type = FcTypeString;
+            familyNameValue.u.s = reinterpret_cast<const FcChar8*>(familyName);
+            FcPatternAddWeak(pattern, FC_FAMILY, familyNameValue, FcFalse);
+        }
         fcpattern_from_skfontstyle(style, pattern);
 
         SkAutoFcCharSet charSet;
         FcCharSetAddChar(charSet, character);
         FcPatternAddCharSet(pattern, FC_CHARSET, charSet);
 
         if (bcp47Count > 0) {
             SkASSERT(bcp47);
             SkAutoFcLangSet langSet;
             for (int i = bcp47Count; i --> 0;) {
@@ skipping 62 matching lines @@
             return typeface.detach();
         }
 
         return this->matchFamilyStyle(NULL, style);
     }
 };
 
 SkFontMgr* SkFontMgr::Factory() {
     return SkNEW(SkFontMgr_fontconfig);
 }