Re: [PATCH v2] tests: qmp-cmd-test: fix memory leak

[Li Qiang <liq3ea@gmail.com>]

Markus Armbruster <armbru@redhat.com> 于2020年7月16日周四 下午1:59写道：
>
> Li Qiang <liq3ea@163.com> writes:
>
> > Properly free each test response to avoid memory leak and separate
> > qtest_qmp() calls with spare lines, in a consistent manner.
> >
> > Fixes: 5b88849e7b9("tests/qmp-cmd-test: Add
> > qmp/object-add-failure-modes"
>
> The patch also fixes leaks introduced in 442b09b83d and 9fc719b869,
> actually.  At least it should, but the patch appears to be incomplete.
>
> >
> > Reviewed-by: Eric Auger <eric.auger@redhat.com>
> > Signed-off-by: Li Qiang <liq3ea@163.com>
> > ---
> > Change sincve v1: add detailed commit message
> >
> > tests/qtest/qmp-cmd-test.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> > diff --git a/tests/qtest/qmp-cmd-test.c b/tests/qtest/qmp-cmd-test.c
> > index c68f99f659..f7b1aa7fdc 100644
> > --- a/tests/qtest/qmp-cmd-test.c
> > +++ b/tests/qtest/qmp-cmd-test.c
> > @@ -230,6 +230,8 @@ static void test_object_add_failure_modes(void)
>    static void test_object_add_failure_modes(void)
>    {
>        QTestState *qts;
>        QDict *resp;
>
>        /* attempt to create an object without props */
>        qts = qtest_init(common_args);
>        resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
>                         " {'qom-type': 'memory-backend-ram', 'id': 'ram1' } }");
>        g_assert_nonnull(resp);
>        qmp_assert_error_class(resp, "GenericError");
>
> Doesn't @resp leak here, too?

No, qmp_assert_error_class will call qobject_unref(rsp) will so will not leak.
In fact, I think this is a inconsistent for 'qtest_qmp'.
I think we can apply this patch first and then change the
'qmp_assert_error_class' or/and others
to free resp. And just let the caller of 'qtest_qmp' frees unref the rsp.

What's your idea?

Thanks,
Li Qiang


>
>        /* attempt to create an object without qom-type */
>        resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
>                         " {'id': 'ram1' } }");
>        g_assert_nonnull(resp);
>        qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
>        /* attempt to delete an object that does not exist */
>        resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
>                         " {'id': 'ram1' } }");
>        g_assert_nonnull(resp);
>        qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
>        /* attempt to create 2 objects with duplicate id */
>        resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
>                         " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
> >                       " 'props': {'size': 1048576 } } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> > +
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
> >                       " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
> >                       " 'props': {'size': 1048576 } } }");
>        g_assert_nonnull(resp);
>        qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
>        /* delete ram1 object */
>        resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
> > @@ -241,6 +243,7 @@ static void test_object_add_failure_modes(void)
> >                       " {'id': 'ram1' } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* attempt to create an object with a property of a wrong type */
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
>                         " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
>                         " 'props': {'size': '1048576' } } }");
> > @@ -249,17 +252,20 @@ static void test_object_add_failure_modes(void)
> >      g_assert_nonnull(resp);
> >      /* now do it right */
> >      qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
> > +
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
> >                       " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
> >                       " 'props': {'size': 1048576 } } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* delete ram1 object */
> >      resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
> >                       " {'id': 'ram1' } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* attempt to create an object without the id */
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
>                         " {'qom-type': 'memory-backend-ram',"
> > @@ -267,18 +273,21 @@ static void test_object_add_failure_modes(void)
> >                       " 'props': {'size': 1048576 } } }");
> >      g_assert_nonnull(resp);
> >      qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
> > +
> >      /* now do it right */
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
> >                       " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
> >                       " 'props': {'size': 1048576 } } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* delete ram1 object */
> >      resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
> >                       " {'id': 'ram1' } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* attempt to set a non existing property */
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
>                         " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
> > @@ -286,23 +295,27 @@ static void test_object_add_failure_modes(void)
> >                       " 'props': {'sized': 1048576 } } }");
> >      g_assert_nonnull(resp);
> >      qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
> > +
> >      /* now do it right */
> >      resp = qtest_qmp(qts, "{'execute': 'object-add', 'arguments':"
> >                       " {'qom-type': 'memory-backend-ram', 'id': 'ram1',"
> >                       " 'props': {'size': 1048576 } } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* delete ram1 object without id */
> >      resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
> >                       " {'ida': 'ram1' } }");
> >      g_assert_nonnull(resp);
> > +    qobject_unref(resp);
> >
> >      /* delete ram1 object */
> >      resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
> >                       " {'id': 'ram1' } }");
> >      g_assert_nonnull(resp);
> >      g_assert(qdict_haskey(resp, "return"));
> > +    qobject_unref(resp);
> >
> >      /* delete ram1 object that does not exist anymore*/
> >      resp = qtest_qmp(qts, "{'execute': 'object-del', 'arguments':"
>                         " {'id': 'ram1' } }");
>        g_assert_nonnull(resp);
>        qmp_assert_error_class(resp, "GenericError");
>
> Likewise.
>
>        qtest_quit(qts);
>    }
>