Re: [Qemu-devel] [PATCH] tests/check-qjson: fix a leak

[Markus Armbruster <armbru@redhat.com>]

Thomas Huth <thuth@redhat.com> writes:

> On 2018-09-03 07:51, Markus Armbruster wrote:
>> Thomas Huth <thuth@redhat.com> writes:
>> 
>>> On 2018-09-01 23:19, Marc-André Lureau wrote:
>>>> Spotted by ASAN:
>>>> =================================================================
>>>> ==11893==ERROR: LeakSanitizer: detected memory leaks
>>>>
>>>> Direct leak of 1120 byte(s) in 28 object(s) allocated from:
>>>>     #0 0x7fd0515b0c48 in malloc (/lib64/libasan.so.5+0xeec48)
>>>>     #1 0x7fd050ffa3c5 in g_malloc (/lib64/libglib-2.0.so.0+0x523c5)
>>>>     #2 0x559e708b56a4 in qstring_from_str /home/elmarco/src/qq/qobject/qstring.c:66
>>>>     #3 0x559e708b4fe0 in qstring_new /home/elmarco/src/qq/qobject/qstring.c:23
>>>>     #4 0x559e708bda7d in parse_string /home/elmarco/src/qq/qobject/json-parser.c:143
>>>>     #5 0x559e708c1009 in parse_literal /home/elmarco/src/qq/qobject/json-parser.c:484
>>>>     #6 0x559e708c1627 in parse_value /home/elmarco/src/qq/qobject/json-parser.c:547
>>>>     #7 0x559e708c1c67 in json_parser_parse /home/elmarco/src/qq/qobject/json-parser.c:573
>>>>     #8 0x559e708bc0ff in json_message_process_token /home/elmarco/src/qq/qobject/json-streamer.c:92
>>>>     #9 0x559e708d1655 in json_lexer_feed_char /home/elmarco/src/qq/qobject/json-lexer.c:292
>>>>     #10 0x559e708d1fe1 in json_lexer_feed /home/elmarco/src/qq/qobject/json-lexer.c:339
>>>>     #11 0x559e708bc856 in json_message_parser_feed /home/elmarco/src/qq/qobject/json-streamer.c:121
>>>>     #12 0x559e708b8b4b in qobject_from_jsonv /home/elmarco/src/qq/qobject/qjson.c:69
>>>>     #13 0x559e708b8d02 in qobject_from_json /home/elmarco/src/qq/qobject/qjson.c:83
>>>>     #14 0x559e708a74ae in from_json_str /home/elmarco/src/qq/tests/check-qjson.c:30
>>>>     #15 0x559e708a9f83 in utf8_string /home/elmarco/src/qq/tests/check-qjson.c:781
>>>>     #16 0x7fd05101bc49 in test_case_run gtestutils.c:2255
>>>>     #17 0x7fd05101bc49 in g_test_run_suite_internal gtestutils.c:2339
>>>>
>>>> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
>>>> ---
>>>>  tests/check-qjson.c | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/tests/check-qjson.c b/tests/check-qjson.c
>>>> index cc13f3d41e..d876a7a96e 100644
>>>> --- a/tests/check-qjson.c
>>>> +++ b/tests/check-qjson.c
>>>> @@ -780,6 +780,7 @@ static void utf8_string(void)
>>>>              if (!strstr(json_out, "\\uFFFD")) {
>>>>                  str = from_json_str(json_out, j, &error_abort);
>>>>                  g_assert_cmpstr(qstring_get_try_str(str), ==, utf8_in);
>>>> +                qobject_unref(str);
>>>>              }
>>>>          }
>>>>      }
>>>>
>>>
>>> There are other occurances of from_json_str() which are not followed by
>>> an object_unref() ... do they need to be fixed as well?
>>> (e.g. at the end of escaped_string(), or earlier in utf8_string())
>> 
>> These are all asserted to be null, aren't they?
>
> Ah, right, sorry, it's still too early in the morning here, I guess ;-)

I was about to write "I should've waited for the coffee to kick in" when
I remembered what g_assert(!str) means :)