diff options
| author | Denis V. Lunev <den@openvz.org> | 2008-01-18 23:55:19 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:08:08 -0800 |
| commit | 775516bfa2bd7993620c9039191a0c30b8d8a496 (patch) | |
| tree | 7385f35edda9f4124b802ccf337c55070d2e00bc /net/ipv4/fib_frontend.c | |
| parent | b7c6ba6eb1234e35a74fb8ba8123232a7b1ba9e4 (diff) | |
| download | linux-775516bfa2bd7993620c9039191a0c30b8d8a496.tar.bz2 | |
[NETNS]: Namespace stop vs 'ip r l' race.
During network namespace stop process kernel side netlink sockets
belonging to a namespace should be closed. They should not prevent
namespace to stop, so they do not increment namespace usage
counter. Though this counter will be put during last sock_put.
The raplacement of the correct netns for init_ns solves the problem
only partial as socket to be stoped until proper stop is a valid
netlink kernel socket and can be looked up by the user processes. This
is not a problem until it resides in initial namespace (no processes
inside this net), but this is not true for init_net.
So, hold the referrence for a socket, remove it from lookup tables and
only after that change namespace and perform a last put.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Tested-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
| -rw-r--r-- | net/ipv4/fib_frontend.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index e787d2151152..62bd791c204e 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -869,19 +869,14 @@ static int nl_fib_lookup_init(struct net *net) nl_fib_input, NULL, THIS_MODULE); if (sk == NULL) return -EAFNOSUPPORT; - /* Don't hold an extra reference on the namespace */ - put_net(sk->sk_net); net->ipv4.fibnl = sk; return 0; } static void nl_fib_lookup_exit(struct net *net) { - /* At the last minute lie and say this is a socket for the - * initial network namespace. So the socket will be safe to free. - */ - net->ipv4.fibnl->sk_net = get_net(&init_net); netlink_kernel_release(net->ipv4.fibnl); + net->ipv4.fibnl = NULL; } static void fib_disable_ip(struct net_device *dev, int force) |