linux-kernel - [PATCH net] staging: fsl-dpaa2: ethsw: Add missing netdevice check

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Date:   Fri, 22 Feb 2019 14:02:14 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Ioana Radulescu <ruxandra.radulescu@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org (open list:DPAA2 ETHERNET SWITCH DRIVER),
        devel@...verdev.osuosl.org (open list:STAGING SUBSYSTEM)
Subject: [PATCH net] staging: fsl-dpaa2: ethsw: Add missing netdevice check

port_switchdev_event() does not check that the target network device is
actually backed by the ethsw driver, this could be problematic in a
stacked environment case.

Fixes: 44baaa43d7cc ("staging: fsl-dpaa2/ethsw: Add Freescale DPAA2 Ethernet Switch driver")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/staging/fsl-dpaa2/ethsw/ethsw.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
index daabaceeea52..2edd82f5229a 100644
--- a/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
+++ b/drivers/staging/fsl-dpaa2/ethsw/ethsw.c
@@ -1047,6 +1047,9 @@ static int port_switchdev_event(struct notifier_block *unused,
 	struct ethsw_switchdev_event_work *switchdev_work;
 	struct switchdev_notifier_fdb_info *fdb_info = ptr;
 
+	if (!ethsw_port_dev_check(dev))
+		return NOTIFY_DONE;
+
 	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
 	if (!switchdev_work)
 		return NOTIFY_BAD;
-- 
2.17.1