Fix Symbol.description API reference count management (#4267)

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/api/jerry.c

@@ -3815,7 +3815,7 @@ jerry_get_symbol_description (const jerry_value_t symbol) /**< symbol value */
   }
 
   /* Note: This operation cannot throw an error */
-  return ecma_get_symbol_description (ecma_get_symbol_from_value (symbol));
+  return ecma_copy_value (ecma_get_symbol_description (ecma_get_symbol_from_value (symbol)));
 #else /* !ENABLED (JERRY_ESNEXT) */
   JERRY_UNUSED (symbol);
 

tests/unit-core/test-symbol.c

@@ -191,6 +191,7 @@ main (void)
   jerry_string_to_char_buffer (bar_symbol_string, str_buff, bar_symbol_string_size);
   TEST_ASSERT (memcmp (str_buff, STRING_BAR, sizeof (SYMBOL_DESCIPTION_BAR) - 1) == 0);
 
+  jerry_release_value (bar_symbol_string);
   jerry_release_value (bar_symbol);
 
   /* Test symbol get description operation with undefined description */