xfrm6: remove BUG_ON from xfrm6_dst_ifdown

if loopback_idev is NULL pointer, and the following access of
loopback_idev will trigger panic, which is same as BUG_ON

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index d35bcf92969c826b9d331bdd86ad8476dcad66ed..769f8f78d3b8955a509cedc1f3823dbb7d3dce44 100644 (file)
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -262,7 +262,6 @@ static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
        if (xdst->u.rt6.rt6i_idev->dev == dev) {
                struct inet6_dev *loopback_idev =
                        in6_dev_get(dev_net(dev)->loopback_dev);
-               BUG_ON(!loopback_idev);
 
                do {
                        in6_dev_put(xdst->u.rt6.rt6i_idev);