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

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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>
This commit is contained in:
Hans Schillstrom 2011-04-04 15:25:18 +02:00 committed by Patrick McHardy
parent b4232a2277
commit a09d19779f
2 changed files with 2 additions and 2 deletions
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2
include/net/ip_vs.h
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@ -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__);

2
net/netfilter/ipvs/ip_vs_ctl.c
View File

@ -3120,7 +3120,7 @@ static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __be32 state,
static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct net *net = skb_net(skb);
struct net *net = skb_sknet(skb);
struct netns_ipvs *ipvs = net_ipvs(net);
mutex_lock(&__ip_vs_mutex);