igmp: Fix a data-race around sysctl_igmp_max_memberships.

[ Upstream commit 6305d821e3b9b5379d348528e5b5faf316383bc2 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 6e217424e0ff4990fe64ce6ba8c071e8a9ad722d..3c09bee931b7a4f03a91ffa9d9ab7340edc3d0de 100644 (file)
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2171,7 +2171,7 @@ 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)