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Tue, 14 Jul 2020 16:02:03 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 2EACD17741CA; Tue, 14 Jul 2020 18:02:02 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH for-5.1 2/5] qom: Plug memory leak in "info qom-tree" Date: Tue, 14 Jul 2020 18:01:59 +0200 Message-Id: <20200714160202.3121879-3-armbru@redhat.com> In-Reply-To: <20200714160202.3121879-1-armbru@redhat.com> References: <20200714160202.3121879-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=205.139.110.120; envelope-from=armbru@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/14 01:42:04 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: lvivier@redhat.com, thuth@redhat.com, berrange@redhat.com, ehabkost@redhat.com, pbonzini@redhat.com, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Commit e8c9e65816 "qom: Make "info qom-tree" show children sorted" created a memory leak, because I didn't realize object_get_canonical_path_component()'s value needs to be freed. Reproducer: $ qemu-system-x86_64 -nodefaults -display none -S -monitor stdio QEMU 5.0.50 monitor - type 'help' for more information (qemu) info qom-tree This leaks some 4500 path components, 12-13 characters on average, i.e. roughly 100kBytes depending on the allocator. A couple of hundred "info qom-tree" here, a couple of hundred there, and soon enough we're talking about real memory. Plug the leak. Fixes: e8c9e65816f5dbfe18ad3b2be938d0d8192d459a Signed-off-by: Markus Armbruster --- qom/qom-hmp-cmds.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/qom/qom-hmp-cmds.c b/qom/qom-hmp-cmds.c index 9ed8bb1c9f..aaacadacca 100644 --- a/qom/qom-hmp-cmds.c +++ b/qom/qom-hmp-cmds.c @@ -96,8 +96,10 @@ static void print_qom_composition(Monitor *mon, Object *obj, int indent); static int qom_composition_compare(const void *a, const void *b, void *ignore) { - return g_strcmp0(a ? object_get_canonical_path_component(a) : NULL, - b ? object_get_canonical_path_component(b) : NULL); + g_autofree char *ac = object_get_canonical_path_component(a); + g_autofree char *bc = object_get_canonical_path_component(b); + + return g_strcmp0(ac, bc); } static int insert_qom_composition_child(Object *obj, void *opaque) -- 2.26.2