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netfilter: xt_socket: check sk before checking for netns. 

Only check for the network namespace if the socket is available.

Fixes: f564650106 ("netfilter: check if the socket netns is correct.")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Flavio Leitner 2018-09-27 19:36:28 -03:00 committed by Pablo Neira Ayuso
parent 421c119f55
commit 40e4f26e6a
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/xt_socket.c
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@ -56,7 +56,7 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par,
struct sk_buff *pskb = (struct sk_buff *)skb;
struct sock *sk = skb->sk;
if (!net_eq(xt_net(par), sock_net(sk)))
if (sk && !net_eq(xt_net(par), sock_net(sk)))
sk = NULL;
if (!sk)
@ -117,7 +117,7 @@ socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
struct sk_buff *pskb = (struct sk_buff *)skb;
struct sock *sk = skb->sk;
if (!net_eq(xt_net(par), sock_net(sk)))
if (sk && !net_eq(xt_net(par), sock_net(sk)))
sk = NULL;
if (!sk)