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[IPV6]: Ensure to use icmpv6_socket in non-preemptive context.

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We saw following trace several times:

|BUG: using smp_processor_id() in preemptible [00000001] code: httpd/30137
|caller is icmpv6_send+0x23/0x540
| [<c01ad63b>] smp_processor_id+0x9b/0xb8
| [<c02993e7>] icmpv6_send+0x23/0x540

This is because of icmpv6_socket, which is the only one user of
smp_processor_id() in icmpv6_send(), AFAIK.

Since it should be used in non-preemptive context,
let's defer the dereference after disabling preemption
(by icmpv6_xmit_lock()).

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki 2005-06-13 14:59:44 -07:00 committed by David S. Miller
parent 979b6c135f
commit 84427d5330
1 changed files with 10 additions and 4 deletions
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14
net/ipv6/icmp.c
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@ -277,8 +277,8 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
{
struct inet6_dev *idev = NULL;
struct ipv6hdr *hdr = skb->nh.ipv6h;
struct sock *sk = icmpv6_socket->sk;
struct ipv6_pinfo *np = inet6_sk(sk);
struct sock *sk;
struct ipv6_pinfo *np;
struct in6_addr *saddr = NULL;
struct dst_entry *dst;
struct icmp6hdr tmp_hdr;
@ -358,6 +358,9 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
if (icmpv6_xmit_lock())
return;
sk = icmpv6_socket->sk;
np = inet6_sk(sk);
if (!icmpv6_xrlim_allow(sk, type, &fl))
goto out;
@ -423,9 +426,9 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
static void icmpv6_echo_reply(struct sk_buff *skb)
{
struct sock *sk = icmpv6_socket->sk;
struct sock *sk;
struct inet6_dev *idev;
struct ipv6_pinfo *np = inet6_sk(sk);
struct ipv6_pinfo *np;
struct in6_addr *saddr = NULL;
struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw;
struct icmp6hdr tmp_hdr;
@ -454,6 +457,9 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
if (icmpv6_xmit_lock())
return;
sk = icmpv6_socket->sk;
np = inet6_sk(sk);
if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
fl.oif = np->mcast_oif;