diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-01-10 16:12:01 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-01-12 14:12:36 +0100 |
| commit | 1e47ee8367babe6a5e8adf44a714c7086657b87e (patch) | |
| tree | 09596b40accfa9adcf21f7b0a26f99cee7d4e0e7 | |
| parent | 4610476d89d53714ca94aae081fa035908bc137a (diff) | |
netfilter: nf_conntrack: fix BUG_ON while removing nf_conntrack with netns
canqun zhang reported that we're hitting BUG_ON in the
nf_conntrack_destroy path when calling kfree_skb while
rmmod'ing the nf_conntrack module.
Currently, the nf_ct_destroy hook is being set to NULL in the
destroy path of conntrack.init_net. However, this is a problem
since init_net may be destroyed before any other existing netns
(we cannot assume any specific ordering while releasing existing
netns according to what I read in recent emails).
Thanks to Gao feng for initial patch to address this issue.
Reported-by: canqun zhang <canqunzhang@gmail.com>
Acked-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | include/net/netfilter/nf_conntrack_core.h | 2 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_core.c | 9 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_standalone.c | 1 |
3 files changed, 8 insertions, 4 deletions
diff --git a/include/net/netfilter/nf_conntrack_core.h b/include/net/netfilter/nf_conntrack_core.h index d8f5b9f5216..e98aeb3da03 100644 --- a/include/net/netfilter/nf_conntrack_core.h +++ b/include/net/netfilter/nf_conntrack_core.h @@ -31,6 +31,8 @@ extern void nf_conntrack_cleanup(struct net *net); extern int nf_conntrack_proto_init(struct net *net); extern void nf_conntrack_proto_fini(struct net *net); +extern void nf_conntrack_cleanup_end(void); + extern bool nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff, diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 016d95ead93..e4a0c4fb3a7 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1376,11 +1376,12 @@ void nf_conntrack_cleanup(struct net *net) synchronize_net(); nf_conntrack_proto_fini(net); nf_conntrack_cleanup_net(net); +} - if (net_eq(net, &init_net)) { - RCU_INIT_POINTER(nf_ct_destroy, NULL); - nf_conntrack_cleanup_init_net(); - } +void nf_conntrack_cleanup_end(void) +{ + RCU_INIT_POINTER(nf_ct_destroy, NULL); + nf_conntrack_cleanup_init_net(); } void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index 363285d544a..e7185c68481 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -575,6 +575,7 @@ static int __init nf_conntrack_standalone_init(void) static void __exit nf_conntrack_standalone_fini(void) { unregister_pernet_subsys(&nf_conntrack_net_ops); + nf_conntrack_cleanup_end(); } module_init(nf_conntrack_standalone_init); |