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Thu, 05 Nov 2026 21:48:17 -0800 (PST) Received: from i4-gl-tmk5904.ad.psu.edu ([130.203.156.186]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-54e26f1bd64sm11903521cf.23.2026.11.05.21.48.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 21:48:16 -0800 (PST) From: Yuho Choi To: "Michael S. Tsirkin" , Jason Wang , Mike Christie Cc: Paolo Bonzini , Stefan Hajnoczi , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Yuho Choi Subject: [PATCH v1] vhost-scsi: do not validate vrings during endpoint teardown Date: Fri, 6 Nov 2026 00:48:07 -0500 Message-ID: <20261106054811.281798-2-oss.patchbox@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: kvm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit vhost_scsi_clear_endpoint() checks every virtqueue with vhost_vq_access_ok() before disabling the backends and waiting for in-flight SCSI commands. If that check fails, endpoint teardown is skipped. vhost_scsi_release() ignores the error and frees the vhost-scsi state. vhost_dev_stop() drains vhost work, but it does not wait for commands owned by the target core. A later command or TMF completion can therefore dereference its saved virtqueue pointer after the virtqueue has been freed. Vring access is not a prerequisite for tearing an endpoint down. Remove the check so teardown always disables the backends and waits for in-flight commands before releasing their state. Fixes: 057cbf49a1f0 ("tcm_vhost: Initial merge for vhost level target fabric driver") Signed-off-by: Yuho Choi --- drivers/vhost/scsi.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index e44044449cef..f0966f25b09a 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -2194,17 +2194,10 @@ vhost_scsi_clear_endpoint(struct vhost_scsi *vs, struct vhost_scsi_tpg *tpg; struct vhost_virtqueue *vq; bool match = false; - int index, ret, i; + int ret, i; u8 target; mutex_lock(&vs->dev.mutex); - /* Verify that ring has been setup correctly. */ - for (index = 0; index < vs->dev.nvqs; ++index) { - if (!vhost_vq_access_ok(&vs->vqs[index].vq)) { - ret = -EFAULT; - goto err_dev; - } - } if (!vs->vs_tpg) { ret = 0; -- 2.43.0