Patch "IB/ipoib: rtnl_unlock can not come after free_netdev" has been added to the 3.18-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    IB/ipoib: rtnl_unlock can not come after free_netdev

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ib-ipoib-rtnl_unlock-can-not-come-after-free_netdev.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct  5 10:58:04 CEST 2017
From: Feras Daoud <ferasda@mellanox.com>
Date: Wed, 28 Dec 2016 14:47:24 +0200
Subject: IB/ipoib: rtnl_unlock can not come after free_netdev

From: Feras Daoud <ferasda@mellanox.com>


[ Upstream commit 89a3987ab7a923c047c6dec008e60ad6f41fac22 ]

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: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/infiniband/ulp/ipoib/ipoib_vlan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -162,11 +162,11 @@ int ipoib_vlan_add(struct net_device *pd
 out:
 	up_write(&ppriv->vlan_rwsem);
 
+	rtnl_unlock();
+
 	if (result)
 		free_netdev(priv->dev);
 
-	rtnl_unlock();
-
 	return result;
 }
 


Patches currently in stable-queue which might be from ferasda@mellanox.com are

queue-3.18/ib-ipoib-replace-list_del-of-the-neigh-list-with-list_del_init.patch
queue-3.18/ib-ipoib-rtnl_unlock-can-not-come-after-free_netdev.patch
queue-3.18/ib-ipoib-fix-deadlock-over-vlan_mutex.patch