diff options
| author |   Kuniyuki Iwashima <kuniyu@amazon.com> | 2022-07-15 10:17:42 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2022-07-18 12:21:53 +0100 |
| commit | 6305d821e3b9b5379d348528e5b5faf316383bc2 (patch) | |
| tree | 872d6b66701028263564aefdfdaf7470d1f70a41 | |
| parent | igmp: Fix data-races around sysctl_igmp_llm_reports. (diff) | |
| download | wireguard-linux-6305d821e3b9b5379d348528e5b5faf316383bc2.tar.xz wireguard-linux-6305d821e3b9b5379d348528e5b5faf316383bc2.zip | |
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>
| -rw-r--r-- | net/ipv4/igmp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index cf75fff170e4..792ea1b56b9e 100644 --- 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) |