Re: [PATCH for-9.2 8/9] tests/qtest/migration-test: Don't strdup in get_dirty_rate()

[Fabiano Rosas <farosas@suse.de>]

Peter Maydell <peter.maydell@linaro.org> writes:

> We g_strdup() the "status" string we get out of the qdict in
> get_dirty_rate(), but we never free it.  Since we only use this
> string while the dictionary is still valid, we don't need to strdup
> at all; drop the unnecessary call to avoid this leak:
>
> Direct leak of 18 byte(s) in 2 object(s) allocated from:
>     #0 0x564b3e01913e in malloc (/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/asan/tests/qtest/migration-test+0x22f13e) (BuildId: d6403a811332fcc846f93c45e23abfd06d1e67c4)
>     #1 0x7f2f278ff738 in g_malloc debian/build/deb/../../../glib/gmem.c:128:13
>     #2 0x7f2f27914583 in g_strdup debian/build/deb/../../../glib/gstrfuncs.c:361:17
>     #3 0x564b3e14bb5b in get_dirty_rate tests/qtest/migration-test.c:3447:14
>     #4 0x564b3e138e00 in test_vcpu_dirty_limit tests/qtest/migration-test.c:3565:16
>     #5 0x564b3e14f417 in migration_test_wrapper tests/qtest/migration-helpers.c:456:5
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  tests/qtest/migration-test.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
> index a659609ccb0..04122120987 100644
> --- a/tests/qtest/migration-test.c
> +++ b/tests/qtest/migration-test.c
> @@ -3435,7 +3435,7 @@ static void wait_for_calc_dirtyrate_complete(QTestState *who,
>  static int64_t get_dirty_rate(QTestState *who)
>  {
>      QDict *rsp_return;
> -    gchar *status;
> +    const char *status;
>      QList *rates;
>      const QListEntry *entry;
>      QDict *rate;
> @@ -3444,7 +3444,7 @@ static int64_t get_dirty_rate(QTestState *who)
>      rsp_return = query_dirty_rate(who);
>      g_assert(rsp_return);
>  
> -    status = g_strdup(qdict_get_str(rsp_return, "status"));
> +    status = qdict_get_str(rsp_return, "status");
>      g_assert(status);
>      g_assert_cmpstr(status, ==, "measured");

Reviewed-by: Fabiano Rosas <farosas@suse.de>