igmp: Fix a data-race around sysctl_igmp_max_memberships.

While reading sysctl_igmp_max_memberships, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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)