linux-kernel - [PATCH 4.9 090/108] vhost/vsock: handle vhost_vq_init

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Date:   Thu, 15 Jun 2017 19:53:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 090/108] vhost/vsock: handle vhost_vq_init_access() error

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Hajnoczi <stefanha@...hat.com>


[ Upstream commit 0516ffd88fa0d006ee80389ce14a9ca5ae45e845 ]

Propagate the error when vhost_vq_init_access() fails and set
vq->private_data to NULL.

Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/vhost/vsock.c |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -368,6 +368,7 @@ static void vhost_vsock_handle_rx_kick(s
 
 static int vhost_vsock_start(struct vhost_vsock *vsock)
 {
+	struct vhost_virtqueue *vq;
 	size_t i;
 	int ret;
 
@@ -378,19 +379,20 @@ static int vhost_vsock_start(struct vhos
 		goto err;
 
 	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
-		struct vhost_virtqueue *vq = &vsock->vqs[i];
+		vq = &vsock->vqs[i];
 
 		mutex_lock(&vq->mutex);
 
 		if (!vhost_vq_access_ok(vq)) {
 			ret = -EFAULT;
-			mutex_unlock(&vq->mutex);
 			goto err_vq;
 		}
 
 		if (!vq->private_data) {
 			vq->private_data = vsock;
-			vhost_vq_init_access(vq);
+			ret = vhost_vq_init_access(vq);
+			if (ret)
+				goto err_vq;
 		}
 
 		mutex_unlock(&vq->mutex);
@@ -400,8 +402,11 @@ static int vhost_vsock_start(struct vhos
 	return 0;
 
 err_vq:
+	vq->private_data = NULL;
+	mutex_unlock(&vq->mutex);
+
 	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
-		struct vhost_virtqueue *vq = &vsock->vqs[i];
+		vq = &vsock->vqs[i];
 
 		mutex_lock(&vq->mutex);
 		vq->private_data = NULL;