From c4a6853d8fb2b122686bc6a7c472956e87090f4e Mon Sep 17 00:00:00 2001 From: Marcelo Ricardo Leitner Date: Fri, 20 Mar 2015 11:37:17 -0300 Subject: [PATCH] ipv6: invert join/leave anycast rtnl/socket locking order Commit baf606d9c9b1 ("ipv4,ipv6: grab rtnl before locking the socket") missed to update two setsockopt options, IPV6_JOIN_ANYCAST and IPV6_LEAVE_ANYCAST, causing a lock inverstion regarding to the updated ones. As ipv6_sock_ac_join and ipv6_sock_ac_leave are only called from do_ipv6_setsockopt, we are good to just move the rtnl lock upper. Fixes: baf606d9c9b1 ("ipv4,ipv6: grab rtnl before locking the socket") Reported-by: Ying Huang Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- net/ipv6/anycast.c | 12 +++++------- net/ipv6/ipv6_sockglue.c | 2 ++ 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c index baf2742d1ec4..9e6b0ee563f0 100644 --- a/net/ipv6/anycast.c +++ b/net/ipv6/anycast.c @@ -60,6 +60,8 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) int ishost = !net->ipv6.devconf_all->forwarding; int err = 0; + ASSERT_RTNL(); + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; if (ipv6_addr_is_multicast(addr)) @@ -73,7 +75,6 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) pac->acl_next = NULL; pac->acl_addr = *addr; - rtnl_lock(); if (ifindex == 0) { struct rt6_info *rt; @@ -130,7 +131,6 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) } error: - rtnl_unlock(); if (pac) sock_kfree_s(sk, pac, sizeof(*pac)); return err; @@ -146,7 +146,8 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) struct ipv6_ac_socklist *pac, *prev_pac; struct net *net = sock_net(sk); - rtnl_lock(); + ASSERT_RTNL(); + prev_pac = NULL; for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) { if ((ifindex == 0 || pac->acl_ifindex == ifindex) && @@ -154,10 +155,8 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) break; prev_pac = pac; } - if (!pac) { - rtnl_unlock(); + if (!pac) return -ENOENT; - } if (prev_pac) prev_pac->acl_next = pac->acl_next; else @@ -166,7 +165,6 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) dev = __dev_get_by_index(net, pac->acl_ifindex); if (dev) ipv6_dev_ac_dec(dev, &pac->acl_addr); - rtnl_unlock(); sock_kfree_s(sk, pac, sizeof(*pac)); return 0; diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index cc5883791bac..9b2cb1444230 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -122,6 +122,8 @@ static bool setsockopt_needs_rtnl(int optname) switch (optname) { case IPV6_ADD_MEMBERSHIP: case IPV6_DROP_MEMBERSHIP: + case IPV6_JOIN_ANYCAST: + case IPV6_LEAVE_ANYCAST: case MCAST_JOIN_GROUP: case MCAST_LEAVE_GROUP: case MCAST_JOIN_SOURCE_GROUP: -- 2.34.1