netdev - [PATCH 6/9] xfrm: check for xdo_dev_state

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Date:   Fri, 22 Dec 2017 12:24:36 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     David Miller <davem@...emloft.net>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH 6/9] xfrm: check for xdo_dev_state_free

From: Shannon Nelson <shannon.nelson@...cle.com>

The current XFRM code assumes that we've implemented the
xdo_dev_state_free() callback, even if it is meaningless to the driver.
This patch adds a check for it before calling, as done in other APIs,
to prevent a NULL function pointer kernel crash.

Signed-off-by: Shannon Nelson <shannon.nelson@...cle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 include/net/xfrm.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 357764a2bb4e..079ea9455bcd 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1933,7 +1933,8 @@ static inline void xfrm_dev_state_free(struct xfrm_state *x)
 	 struct net_device *dev = xso->dev;
 
 	if (dev && dev->xfrmdev_ops) {
-		dev->xfrmdev_ops->xdo_dev_state_free(x);
+		if (dev->xfrmdev_ops->xdo_dev_state_free)
+			dev->xfrmdev_ops->xdo_dev_state_free(x);
 		xso->dev = NULL;
 		dev_put(dev);
 	}
-- 
2.14.1