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Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Stefan Hajnoczi , Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Xiang Mei , Bobby Eshleman Subject: Re: [PATCH v3 2/2] vsock/virtio: avoid refilling the RX queue after teardown Message-ID: References: <20260729185831.3247971-1-bestswngs@gmail.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Jul 29, 2026 at 12:16:55PM -0700, Weiming Shi wrote: > Commit b917507e5ad9 ("vsock/virtio: stop workers during the .remove()") > made the RX worker jump to its common exit when rx_run is clear. That > exit still refills the RX queue when the buffer count is low, so work > queued across virtio_vsock_vqs_del() can add buffers after the virtqueues > have been deleted. > > BUG: KASAN: slab-use-after-free in virtqueue_add_sgs > Read of size 4 by task kworker/0:1 > Workqueue: virtio_vsock virtio_transport_rx_work > Call Trace: > virtqueue_add_sgs (drivers/virtio/virtio_ring.c:2796) > virtio_vsock_rx_fill (net/vmw_vsock/virtio_transport.c:332) > virtio_transport_rx_work (net/vmw_vsock/virtio_transport.c:701) > process_one_work (kernel/workqueue.c:3314) > worker_thread (kernel/workqueue.c:3478) > kthread (kernel/kthread.c:436) > ret_from_fork (arch/x86/kernel/process.c:158) > ret_from_fork_asm (arch/x86/entry/entry_64.S:245) > ... > Freed by task 141: > kfree (mm/slub.c:6566) > vp_del_vq (drivers/virtio/virtio_pci_common.c:259) > vp_del_vqs (drivers/virtio/virtio_pci_common.c:285) > virtio_vsock_freeze (net/vmw_vsock/virtio_transport.c:912) > virtio_device_freeze (drivers/virtio/virtio.c:658) > virtio_pci_freeze (drivers/virtio/virtio_pci_common.c:601) > pci_pm_freeze (drivers/pci/pci-driver.c:1098) > device_suspend (drivers/base/power/main.c:1968) > Kernel panic - not syncing: KASAN: panic_on_warn set ... > > Jump to a no-refill exit when rx_run is clear, leaving the normal exit > to replenish a running queue. > > Fixes: b917507e5ad9 ("vsock/virtio: stop workers during the .remove()") > Cc: stable@vger.kernel.org > Reported-by: Xiang Mei > Link: https://lore.kernel.org/r/20260727035804.1860862-1-bestswngs@gmail.com > Suggested-by: Stefano Garzarella > Assisted-by: OpenAI-Codex:gpt-5 > Signed-off-by: Weiming Shi > --- > net/vmw_vsock/virtio_transport.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c > index a8e1dd95ba8c..96c9fe8d357c 100644 > --- a/net/vmw_vsock/virtio_transport.c > +++ b/net/vmw_vsock/virtio_transport.c > @@ -638,7 +638,7 @@ static void virtio_transport_rx_work(struct work_struct *work) > mutex_lock(&vsock->rx_lock); > > if (!vsock->rx_run) > - goto out; > + goto out_nofill; > > vq = vsock->vqs[VSOCK_VQ_RX]; > > @@ -692,6 +692,7 @@ static void virtio_transport_rx_work(struct work_struct *work) > out: > if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) > virtio_vsock_rx_fill(vsock); > +out_nofill: > mutex_unlock(&vsock->rx_lock); > } > > -- > 2.55.0 > Reviewed-by: Bobby Eshleman