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Diffstat (limited to 'net/ipv6/icmp.c')
-rw-r--r--net/ipv6/icmp.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index abedf95fdf2d..b3157a0cc15d 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -91,19 +91,22 @@ static struct inet6_protocol icmpv6_protocol = {
91 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, 91 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
92}; 92};
93 93
94static __inline__ int icmpv6_xmit_lock(struct sock *sk) 94static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
95{ 95{
96 struct sock *sk;
97
96 local_bh_disable(); 98 local_bh_disable();
97 99
100 sk = icmpv6_sk(net);
98 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { 101 if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
99 /* This can happen if the output path (f.e. SIT or 102 /* This can happen if the output path (f.e. SIT or
100 * ip6ip6 tunnel) signals dst_link_failure() for an 103 * ip6ip6 tunnel) signals dst_link_failure() for an
101 * outgoing ICMP6 packet. 104 * outgoing ICMP6 packet.
102 */ 105 */
103 local_bh_enable(); 106 local_bh_enable();
104 return 1; 107 return NULL;
105 } 108 }
106 return 0; 109 return sk;
107} 110}
108 111
109static __inline__ void icmpv6_xmit_unlock(struct sock *sk) 112static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
@@ -392,11 +395,10 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
392 fl.fl_icmp_code = code; 395 fl.fl_icmp_code = code;
393 security_skb_classify_flow(skb, &fl); 396 security_skb_classify_flow(skb, &fl);
394 397
395 sk = icmpv6_sk(net); 398 sk = icmpv6_xmit_lock(net);
396 np = inet6_sk(sk); 399 if (sk == NULL)
397
398 if (icmpv6_xmit_lock(sk))
399 return; 400 return;
401 np = inet6_sk(sk);
400 402
401 if (!icmpv6_xrlim_allow(sk, type, &fl)) 403 if (!icmpv6_xrlim_allow(sk, type, &fl))
402 goto out; 404 goto out;
@@ -539,11 +541,10 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
539 fl.fl_icmp_type = ICMPV6_ECHO_REPLY; 541 fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
540 security_skb_classify_flow(skb, &fl); 542 security_skb_classify_flow(skb, &fl);
541 543
542 sk = icmpv6_sk(net); 544 sk = icmpv6_xmit_lock(net);
543 np = inet6_sk(sk); 545 if (sk == NULL)
544
545 if (icmpv6_xmit_lock(sk))
546 return; 546 return;
547 np = inet6_sk(sk);
547 548
548 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 549 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
549 fl.oif = np->mcast_oif; 550 fl.oif = np->mcast_oif;