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

[Eric Blake <eblake@redhat.com>]

On 10/2/18 11:26 AM, Li Qiang wrote:
> Spotted by ASAN.
> 
> =================================================================
> ==17531==ERROR: LeakSanitizer: detected memory leaks
> 
> Direct leak of 1120 byte(s) in 28 object(s) allocated from:
>      #0 0x7f9fb85eeb50 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb50)
>      #1 0x7f9fb824b8d8 in g_malloc (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x518d8)
>      #2 0x5654ae94f073 in qstring_from_str qobject/qstring.c:66
>      #3 0x5654ae94ede7 in qstring_new qobject/qstring.c:23
>      #4 0x5654ae953b6b in parse_string qobject/json-parser.c:143
>      #5 0x5654ae955e3e in parse_literal qobject/json-parser.c:484
>      #6 0x5654ae956227 in parse_value qobject/json-parser.c:547
>      #7 0x5654ae9565c7 in json_parser_parse qobject/json-parser.c:573
>      #8 0x5654ae952d5d in json_message_process_token qobject/json-streamer.c:92
>      #9 0x5654ae9608fa in json_lexer_feed_char qobject/json-lexer.c:313
>      #10 0x5654ae960ea5 in json_lexer_feed qobject/json-lexer.c:350
>      #11 0x5654ae9530de in json_message_parser_feed qobject/json-streamer.c:121
>      #12 0x5654ae950b6e in qobject_from_jsonv qobject/qjson.c:69
>      #13 0x5654ae950d30 in qobject_from_json qobject/qjson.c:83
>      #14 0x5654ae9449af in from_json_str tests/check-qjson.c:30
>      #15 0x5654ae946399 in utf8_string tests/check-qjson.c:781
>      #16 0x7f9fb826cc39  (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x72c39)
> 
> Signed-off-by: Li Qiang <liq3ea@163.com>
> ---
>   tests/check-qjson.c | 1 +
>   1 file changed, 1 insertion(+)

Latent in commit 6ad8444f6, became a bug in commit c473c379.

Reviewed-by: Eric Blake <eblake@redhat.com>

> 
> 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);
>               }
>           }
>       }
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org