IPVS: fix NULL ptr dereference in ip_vs_ctl.c ip_vs_genl_dump_daemons()

ipvsadm -ln --daemon will trigger a Null pointer exception because
ip_vs_genl_dump_daemons() uses skb_net() instead of skb_sknet().

To prevent others from NULL ptr a check is made in ip_vs.h skb_net().

Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 30b49ed72f0d..4d1b71ae82ba 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -52,7 +52,7 @@ static inline struct net *skb_net(const struct sk_buff *skb)
          */
         if (likely(skb->dev && skb->dev->nd_net))
                 return dev_net(skb->dev);
-        if (skb_dst(skb)->dev)
+        if (skb_dst(skb) && skb_dst(skb)->dev)
                 return dev_net(skb_dst(skb)->dev);
         WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
                       __func__, __LINE__);