igmp: Fix a data-race around sysctl_igmp_max_memberships.

[linux-2.6-microblaze.git] / net / ipv4 / igmp.c

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index cf75fff..792ea1b 100644 (file)
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2197,7 +2197,7 @@ static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
                count++;
        }
        err = -ENOBUFS;
-       if (count >= net->ipv4.sysctl_igmp_max_memberships)
+       if (count >= READ_ONCE(net->ipv4.sysctl_igmp_max_memberships))
                goto done;
        iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
        if (!iml)