linux-kernel - [PATCH 5.11 01/41] vhost-vdpa: protect concurrent access to vhost device iotlb

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Date:   Mon, 26 Apr 2021 09:29:48 +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, Xie Yongji <xieyongji@...edance.com>,
        Jason Wang <jasowang@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: [PATCH 5.11 01/41] vhost-vdpa: protect concurrent access to vhost device iotlb

From: Xie Yongji <xieyongji@...edance.com>

commit a9d064524fc3cf463b3bb14fa63de78aafb40dab upstream.

Protect vhost device iotlb by vhost_dev->mutex. Otherwise,
it might cause corruption of the list and interval tree in
struct vhost_iotlb if userspace sends the VHOST_IOTLB_MSG_V2
message concurrently.

Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
Cc: stable@...r.kernel.org
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
Acked-by: Jason Wang <jasowang@...hat.com>
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
Link: https://lore.kernel.org/r/20210412095512.178-1-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/vhost/vdpa.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -745,9 +745,11 @@ static int vhost_vdpa_process_iotlb_msg(
 	const struct vdpa_config_ops *ops = vdpa->config;
 	int r = 0;
 
+	mutex_lock(&dev->mutex);
+
 	r = vhost_dev_check_owner(dev);
 	if (r)
-		return r;
+		goto unlock;
 
 	switch (msg->type) {
 	case VHOST_IOTLB_UPDATE:
@@ -768,6 +770,8 @@ static int vhost_vdpa_process_iotlb_msg(
 		r = -EINVAL;
 		break;
 	}
+unlock:
+	mutex_unlock(&dev->mutex);
 
 	return r;
 }