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authorPablo Neira Ayuso <pablo@netfilter.org>2012-07-05 17:42:10 +0400
committerPablo Neira Ayuso <pablo@netfilter.org>2012-07-09 12:53:19 +0400
commit6bd0405bb4196b44f1acb7a58f11382cdaf6f7f0 (patch)
tree823387dda7be307c75c21688cc899f7937fb2c59 /include
parenta73f89a61f92b364f0b4a3be412b5b70553afc23 (diff)
downloadlinux-6bd0405bb4196b44f1acb7a58f11382cdaf6f7f0.tar.xz
netfilter: nf_ct_ecache: fix crash with multiple containers, one shutting down
Hans reports that he's still hitting: BUG: unable to handle kernel NULL pointer dereference at 000000000000027c IP: [<ffffffff813615db>] netlink_has_listeners+0xb/0x60 PGD 0 Oops: 0000 [#3] PREEMPT SMP CPU 0 It happens when adding a number of containers with do: nfct_query(h, NFCT_Q_CREATE, ct); and most likely one namespace shuts down. this problem was supposed to be fixed by: 70e9942 netfilter: nf_conntrack: make event callback registration per-netns Still, it was missing one rcu_access_pointer to check if the callback is set or not. Reported-by: Hans Schillstrom <hans@schillstrom.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include')
-rw-r--r--include/net/netfilter/nf_conntrack_ecache.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/netfilter/nf_conntrack_ecache.h b/include/net/netfilter/nf_conntrack_ecache.h
index a88fb6939387..e1ce1048fe5f 100644
--- a/include/net/netfilter/nf_conntrack_ecache.h
+++ b/include/net/netfilter/nf_conntrack_ecache.h
@@ -78,7 +78,7 @@ nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
struct net *net = nf_ct_net(ct);
struct nf_conntrack_ecache *e;
- if (net->ct.nf_conntrack_event_cb == NULL)
+ if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
return;
e = nf_ct_ecache_find(ct);