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| author | Xie Yongji <xieyongji@bytedance.com> | 2021-04-12 12:55:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-28 14:39:59 +0300 |
| commit | 71777492b745837481630c751111eeb19bb589cf (patch) | |
| tree | 262ba7b0a1d4b93fe050b597b9bb873b7a0b2636 | |
| parent | aea70bd5a45591de27aac367af94d184892c06ab (diff) | |
| download | linux-71777492b745837481630c751111eeb19bb589cf.tar.xz | |
vhost-vdpa: protect concurrent access to vhost device iotlb
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@vger.kernel.org
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210412095512.178-1-xieyongji@bytedance.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/vhost/vdpa.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index fc5707ada024..84e5949bc861 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -749,9 +749,11 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, 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: @@ -772,6 +774,8 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev, r = -EINVAL; break; } +unlock: + mutex_unlock(&dev->mutex); return r; } |