IB/ipoib: rtnl_unlock can not come after free_netdev

commit 89a3987ab7a923c047c6dec008e60ad6f41fac22 upstream.

The ipoib_vlan_add function calls rtnl_unlock after free_netdev,
rtnl_unlock not only releases the lock, but also calls netdev_run_todo.
The latter function browses the net_todo_list array and completes the
unregistration of all its net_device instances. If we call free_netdev
before rtnl_unlock, then netdev_run_todo call over the freed device causes
panic.
To fix, move rtnl_unlock call before free_netdev call.

Fixes: 9baa0b036410 ("IB/ipoib: Add rtnl_link_ops support")
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 8292554bccb5de2387d7e858eaaa1d27ddb6b8b4..7604ae54d7bce77e5e57c5bdd5f0e0a39efb2d6f 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -165,11 +165,11 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 out:
        mutex_unlock(&ppriv->vlan_mutex);
 
+       rtnl_unlock();
+
        if (result)
                free_netdev(priv->dev);
 
-       rtnl_unlock();
-
        return result;
 }