Mozilla bug 1469580 - Ignore charset= in <meta content> if followed by unmatched quote. r=mrbkap.

Author: hsivonen

src/nu/validator/htmlparser/impl/TreeBuilder.java

@@ -3298,17 +3298,20 @@ public static String extractCharsetFromContent(String attributeValue
                     }
             }
         }
-        String charset = null;
         if (start != -1) {
             if (end == -1) {
-                end = buffer.length;
+                if (charsetState == CHARSET_UNQUOTED) {
+                    end = buffer.length;
+                } else {
+                    return null;
+                }
             }
-            charset = Portability.newStringFromBuffer(buffer, start, end
+            return Portability.newStringFromBuffer(buffer, start, end
                     - start
                 // CPPONLY: , tb, false
             );
         }
-        return charset;
+        return null;
     }
 
     private void checkMetaCharset(HtmlAttributes attributes)