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Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_output.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index e9fa68c..8bb3b4a 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -79,6 +79,7 @@
#include <linux/mroute.h>
#include <linux/netlink.h>
#include <linux/tcp.h>
+#include <linux/locallock.h>
int sysctl_ip_default_ttl __read_mostly = IPDEFTTL;
EXPORT_SYMBOL(sysctl_ip_default_ttl);
@@ -1468,6 +1469,9 @@ static DEFINE_PER_CPU(struct inet_sock, unicast_sock) = {
.uc_ttl = -1,
};
+/* serialize concurrent calls on the same CPU to ip_send_unicast_reply */
+static DEFINE_LOCAL_IRQ_LOCK(unicast_lock);
+
void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
__be32 saddr, const struct ip_reply_arg *arg,
unsigned int len)
@@ -1505,8 +1509,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
if (IS_ERR(rt))
return;
- get_cpu_light();
- inet = &__get_cpu_var(unicast_sock);
+ inet = &get_locked_var(unicast_lock, unicast_sock);
inet->tos = arg->tos;
sk = &inet->sk;
@@ -1530,7 +1533,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
ip_push_pending_frames(sk, &fl4);
}
- put_cpu_light();
+ put_locked_var(unicast_lock, unicast_sock);
ip_rt_put(rt);
}