ext/yajl/yajl_encode.c in yajl-ruby-1.3.0 vs ext/yajl/yajl_encode.c in yajl-ruby-1.3.1

@@ -160,11 +160,11 @@
                     unsigned int codepoint = 0;
                     hexToDigit(&codepoint, str + ++end);
                     end+=3;
                     /* check if this is a surrogate */
                     if ((codepoint & 0xFC00) == 0xD800) {
-                        end++;
-                        if (str[end] == '\\' && str[end + 1] == 'u') {
+                        if (end + 2 < len && str[end + 1] == '\\' && str[end + 2] == 'u') {
+                            end++;
                             unsigned int surrogate = 0;
                             hexToDigit(&surrogate, str + end + 2);
                             codepoint =
                                 (((codepoint & 0x3F) << 10) | 
                                  ((((codepoint >> 6) & 0xF) + 1) << 16) |