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xfrm: check for xdo_dev_state_free

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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@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Shannon Nelson 2017-12-19 15:35:47 -08:00 committed by Steffen Klassert
parent f58869c44f
commit 7f05b467a7
1 changed files with 2 additions and 1 deletions
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3
include/net/xfrm.h
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@ -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);
}