Patch "mlxsw: spectrum_router: Fix NULL pointer dereference" has been added to the 4.11-stable tree

[<gregkh@linuxfoundation.org>]

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

    mlxsw: spectrum_router: Fix NULL pointer dereference

to the 4.11-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:
     mlxsw-spectrum_router-fix-null-pointer-dereference.patch
and it can be found in the queue-4.11 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 Mon Jul 17 18:47:09 CEST 2017
From: Ido Schimmel <idosch@mellanox.com>
Date: Wed, 28 Jun 2017 09:03:12 +0300
Subject: mlxsw: spectrum_router: Fix NULL pointer dereference

From: Ido Schimmel <idosch@mellanox.com>


[ Upstream commit 6b27c8adf27edf1dabe2cdcfaa101ef7e2712415 ]

In case a VLAN device is enslaved to a bridge we shouldn't create a
router interface (RIF) for it when it's configured with an IP address.
This is already handled by the driver for other types of netdevs, such
as physical ports and LAG devices.

If this IP address is then removed and the interface is subsequently
unlinked from the bridge, a NULL pointer dereference can happen, as the
original 802.1d FID was replaced with an rFID which was then deleted.

To reproduce:
$ ip link set dev enp3s0np9 up
$ ip link add name enp3s0np9.111 link enp3s0np9 type vlan id 111
$ ip link set dev enp3s0np9.111 up
$ ip link add name br0 type bridge
$ ip link set dev br0 up
$ ip link set enp3s0np9.111 master br0
$ ip address add dev enp3s0np9.111 192.168.0.1/24
$ ip address del dev enp3s0np9.111 192.168.0.1/24
$ ip link set dev enp3s0np9.111 nomaster

Fixes: 99724c18fc66 ("mlxsw: spectrum: Introduce support for router interfaces")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reported-by: Petr Machata <petrm@mellanox.com>
Tested-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3829,6 +3829,9 @@ static int mlxsw_sp_inetaddr_vlan_event(
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_lower_get(vlan_dev);
 	u16 vid = vlan_dev_vlan_id(vlan_dev);
 
+	if (netif_is_bridge_port(vlan_dev))
+		return 0;
+
 	if (mlxsw_sp_port_dev_check(real_dev))
 		return mlxsw_sp_inetaddr_vport_event(vlan_dev, real_dev, event,
 						     vid);


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

queue-4.11/mlxsw-spectrum_router-fix-null-pointer-dereference.patch