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Mon, 9 Mar 2020 09:51:49 +0000 (UTC) Received: from localhost (unknown [10.43.2.114]) by smtp.corp.redhat.com (Postfix) with ESMTP id CEF329051C; Mon, 9 Mar 2020 09:51:47 +0000 (UTC) Date: Mon, 9 Mar 2020 10:51:45 +0100 From: Igor Mammedov To: Pan Nengyuan Subject: Re: [PATCH] qom-qmp-cmds: fix two memleaks in qmp_object_add Message-ID: <20200309105145.2f3f6a81@redhat.com> In-Reply-To: <20200309092212.3249-1-pannengyuan@huawei.com> References: <20200309092212.3249-1-pannengyuan@huawei.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: berrange@redhat.com, ehabkost@redhat.com, qemu-devel@nongnu.org, euler.robot@huawei.com, pbonzini@redhat.com, zhang.zhanghailiang@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, 9 Mar 2020 17:22:12 +0800 Pan Nengyuan wrote: > 'type/id' forgot to free in qmp_object_add, this patch fix that. > > The leak stack: > Direct leak of 84 byte(s) in 6 object(s) allocated from: > #0 0x7fe2a5ebf768 in __interceptor_malloc (/lib64/libasan.so.5+0xef768) > #1 0x7fe2a5044445 in g_malloc (/lib64/libglib-2.0.so.0+0x52445) > #2 0x7fe2a505dd92 in g_strdup (/lib64/libglib-2.0.so.0+0x6bd92) > #3 0x56344954e692 in qmp_object_add /mnt/sdb/qemu-new/qemu_test/qemu/qom/qom-qmp-cmds.c:258 > #4 0x563449960f5a in do_qmp_dispatch /mnt/sdb/qemu-new/qemu_test/qemu/qapi/qmp-dispatch.c:132 > #5 0x563449960f5a in qmp_dispatch /mnt/sdb/qemu-new/qemu_test/qemu/qapi/qmp-dispatch.c:175 > #6 0x563449498a30 in monitor_qmp_dispatch /mnt/sdb/qemu-new/qemu_test/qemu/monitor/qmp.c:145 > #7 0x56344949a64f in monitor_qmp_bh_dispatcher /mnt/sdb/qemu-new/qemu_test/qemu/monitor/qmp.c:234 > #8 0x563449a92a3a in aio_bh_call /mnt/sdb/qemu-new/qemu_test/qemu/util/async.c:136 > > Direct leak of 54 byte(s) in 6 object(s) allocated from: > #0 0x7fe2a5ebf768 in __interceptor_malloc (/lib64/libasan.so.5+0xef768) > #1 0x7fe2a5044445 in g_malloc (/lib64/libglib-2.0.so.0+0x52445) > #2 0x7fe2a505dd92 in g_strdup (/lib64/libglib-2.0.so.0+0x6bd92) > #3 0x56344954e6c4 in qmp_object_add /mnt/sdb/qemu-new/qemu_test/qemu/qom/qom-qmp-cmds.c:267 > #4 0x563449960f5a in do_qmp_dispatch /mnt/sdb/qemu-new/qemu_test/qemu/qapi/qmp-dispatch.c:132 > #5 0x563449960f5a in qmp_dispatch /mnt/sdb/qemu-new/qemu_test/qemu/qapi/qmp-dispatch.c:175 > #6 0x563449498a30 in monitor_qmp_dispatch /mnt/sdb/qemu-new/qemu_test/qemu/monitor/qmp.c:145 > #7 0x56344949a64f in monitor_qmp_bh_dispatcher /mnt/sdb/qemu-new/qemu_test/qemu/monitor/qmp.c:234 > #8 0x563449a92a3a in aio_bh_call /mnt/sdb/qemu-new/qemu_test/qemu/util/async.c:136 > > Fixes: 5f07c4d60d091320186e7b0edaf9ed2cc16b2d1e > Reported-by: Euler Robot > Signed-off-by: Pan Nengyuan > --- > qom/qom-qmp-cmds.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/qom/qom-qmp-cmds.c b/qom/qom-qmp-cmds.c > index 49db926fcc..ac59ba1aa8 100644 > --- a/qom/qom-qmp-cmds.c > +++ b/qom/qom-qmp-cmds.c > @@ -247,8 +247,8 @@ void qmp_object_add(QDict *qdict, QObject **ret_data, Error **errp) > QDict *pdict; > Visitor *v; > Object *obj; > - const char *type; > - const char *id; > + g_autofree const char *type = NULL; > + g_autofree const char *id = NULL; not sure that's it's correct qdict_get_try_str() returns the reference to a string within the QDict, so caller who provided qdict should take care of freeing it. > > type = qdict_get_try_str(qdict, "qom-type"); > if (!type) {