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Date:   Mon, 8 May 2017 10:39:34 +0300
From:   <ilant@...lanox.com>
To:     David Miller <davem@...emloft.net>,
        Steffen Klassert <steffen.klassert@...unet.com>
CC:     Boris Pismenny <borisp@...lanox.com>, <netdev@...r.kernel.org>,
        Ilan Tayari <ilant@...lanox.com>
Subject: [PATCH net v2 1/1] xfrm: Fix NETDEV_DOWN with IPSec offload

From: Ilan Tayari <ilant@...lanox.com>

Upon NETDEV_DOWN event, all xfrm_state objects which are bound to
the device are flushed.

The condition for this is wrong, though, testing dev->hw_features
instead of dev->features. If a device has non-user-modifiable
NETIF_F_HW_ESP, then its xfrm_state objects are not flushed,
causing a crash later on after the device is deleted.

Check dev->features instead of dev->hw_features.

Fixes: d77e38e612a0 ("xfrm: Add an IPsec hardware offloading API")
Signed-off-by: Ilan Tayari <ilant@...lanox.com>
Acked-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 8ec8a3fcf8d4..574e6f32f94f 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -170,7 +170,7 @@ static int xfrm_dev_feat_change(struct net_device *dev)
 
 static int xfrm_dev_down(struct net_device *dev)
 {
-	if (dev->hw_features & NETIF_F_HW_ESP)
+	if (dev->features & NETIF_F_HW_ESP)
 		xfrm_dev_state_flush(dev_net(dev), dev, true);
 
 	xfrm_garbage_collect(dev_net(dev));
-- 
2.11.0

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