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authorEli Cohen <elic@nvidia.com>2022-03-21 17:13:03 +0300
committerMichael S. Tsirkin <mst@redhat.com>2022-03-28 23:54:30 +0300
commitad6dc1daaf29f97f23cc810d60ee01c0e83f4c6b (patch)
tree5fdc2652c8dfa08c0e6e60ed0df08ae3b93fead9 /drivers/vdpa
parent03a91c9af2c42ae14afafb829a4b7e6589ab5892 (diff)
downloadlinux-ad6dc1daaf29f97f23cc810d60ee01c0e83f4c6b.tar.xz
vdpa/mlx5: Avoid processing works if workqueue was destroyed
If mlx5_vdpa gets unloaded while a VM is running, the workqueue will be destroyed. However, vhost might still have reference to the kick function and might attempt to push new works. This could lead to null pointer dereference. To fix this, set mvdev->wq to NULL just before destroying and verify that the workqueue is not NULL in mlx5_vdpa_kick_vq before attempting to push a new work. Fixes: 5262912ef3cf ("vdpa/mlx5: Add support for control VQ and MAC setting") Signed-off-by: Eli Cohen <elic@nvidia.com> Link: https://lore.kernel.org/r/20220321141303.9586-1-elic@nvidia.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vdpa')
-rw-r--r--drivers/vdpa/mlx5/net/mlx5_vnet.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index c0f0ecb82c6f..2f4fb09f1e89 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1712,7 +1712,7 @@ static void mlx5_vdpa_kick_vq(struct vdpa_device *vdev, u16 idx)
return;
if (unlikely(is_ctrl_vq_idx(mvdev, idx))) {
- if (!mvdev->cvq.ready)
+ if (!mvdev->wq || !mvdev->cvq.ready)
return;
wqent = kzalloc(sizeof(*wqent), GFP_ATOMIC);
@@ -2779,9 +2779,12 @@ static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
struct mlx5_vdpa_mgmtdev *mgtdev = container_of(v_mdev, struct mlx5_vdpa_mgmtdev, mgtdev);
struct mlx5_vdpa_dev *mvdev = to_mvdev(dev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+ struct workqueue_struct *wq;
mlx5_notifier_unregister(mvdev->mdev, &ndev->nb);
- destroy_workqueue(mvdev->wq);
+ wq = mvdev->wq;
+ mvdev->wq = NULL;
+ destroy_workqueue(wq);
_vdpa_unregister_device(dev);
mgtdev->ndev = NULL;
}