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M . Jones" , Fabiano Rosas , "Michael S. Tsirkin" , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Subject: [PATCH v2 1/3 for 9.2] hw/virtio: fix crash in processing balloon stats Date: Fri, 29 Nov 2024 13:55:05 +0000 Message-ID: <20241129135507.699030-2-berrange@redhat.com> In-Reply-To: <20241129135507.699030-1-berrange@redhat.com> References: <20241129135507.699030-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=-0.93, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1732888561598019100 balloon_stats_get_all will iterate over guest stats upto the max VIRTIO_BALLOON_S_NR value, calling visit_type_uint64 to populate the QObject dict. The dict keys are obtained from the static array balloon_stat_names which is VIRTIO_BALLOON_S_NR in size. Unfortunately the way that array is declared results in any unassigned stats getting a NULL name, which will then cause visit_type_uint64 to trigger an assert in qobject_output_add_obj. The balloon_stat_names array was fortunately fully populated with names until recently: commit 0d2eeef77a33315187df8519491a900bde4a3d83 Author: Bibo Mao Date: Mon Oct 28 10:38:09 2024 +0800 linux-headers: Update to Linux v6.12-rc5 pulled a change to include/standard-headers/linux/virtio_balloon.h which increased VIRTIO_BALLOON_S_NR by 6, and failed to add the new names to balloon_stat_names. This commit fills in the missing names, and uses a static assert to guarantee that any future changes to VIRTIO_BALLOON_S_NR will cause a build failure until balloon_stat_names is updated. This problem was detected by the Cockpit Project's automated integration tests on QEMU 9.2.0-rc1. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=3D2329448 Fixes: 0d2eeef77a33315187df8519491a900bde4a3d83 Reported-by: Martin Pitt Reviewed-by: Richard W.M. Jones Signed-off-by: Daniel P. Berrang=C3=A9 Reviewed-by: David Hildenbrand Reviewed-by: Michael Tokarev --- hw/virtio/virtio-balloon.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index 609e39a821..afd2ad6dd6 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -167,19 +167,33 @@ static void balloon_deflate_page(VirtIOBalloon *ballo= on, } } =20 +/* + * All stats upto VIRTIO_BALLOON_S_NR /must/ have a + * non-NULL name declared here, since these are used + * as keys for populating the QDict with stats + */ static const char *balloon_stat_names[] =3D { [VIRTIO_BALLOON_S_SWAP_IN] =3D "stat-swap-in", [VIRTIO_BALLOON_S_SWAP_OUT] =3D "stat-swap-out", [VIRTIO_BALLOON_S_MAJFLT] =3D "stat-major-faults", [VIRTIO_BALLOON_S_MINFLT] =3D "stat-minor-faults", [VIRTIO_BALLOON_S_MEMFREE] =3D "stat-free-memory", + [VIRTIO_BALLOON_S_MEMTOT] =3D "stat-total-memory", [VIRTIO_BALLOON_S_AVAIL] =3D "stat-available-memory", [VIRTIO_BALLOON_S_CACHES] =3D "stat-disk-caches", [VIRTIO_BALLOON_S_HTLB_PGALLOC] =3D "stat-htlb-pgalloc", [VIRTIO_BALLOON_S_HTLB_PGFAIL] =3D "stat-htlb-pgfail", - [VIRTIO_BALLOON_S_NR] =3D NULL + + [VIRTIO_BALLOON_S_OOM_KILL] =3D "stat-oom-kills", + [VIRTIO_BALLOON_S_ALLOC_STALL] =3D "stat-alloc-stalls", + [VIRTIO_BALLOON_S_ASYNC_SCAN] =3D "stat-async-scans", + [VIRTIO_BALLOON_S_DIRECT_SCAN] =3D "stat-direct-scans", + [VIRTIO_BALLOON_S_ASYNC_RECLAIM] =3D "stat-async-reclaims", + + [VIRTIO_BALLOON_S_DIRECT_RECLAIM] =3D "stat-direct-reclaims", }; +G_STATIC_ASSERT(G_N_ELEMENTS(balloon_stat_names) =3D=3D VIRTIO_BALLOON_S_N= R); =20 /* * reset_stats - Mark all items in the stats array as unset --=20 2.46.0