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authorJozsef Kadlecsik <kadlec@blackhole.kfki.hu>2012-02-24 11:45:49 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2012-02-24 12:24:15 +0100
commit7d367e06688dc7a2cc98c2ace04e1296e1d987e2 (patch)
treebf4a9a6497dec37fdd4a31999cb218277e2ba656 /include
parent279072882dc0149e5740dace075e1a49f087046d (diff)
downloadlinux-linaro-stable-7d367e06688dc7a2cc98c2ace04e1296e1d987e2.tar.gz
netfilter: ctnetlink: fix soft lockup when netlink adds new entries (v2)
Marcell Zambo and Janos Farago noticed and reported that when new conntrack entries are added via netlink and the conntrack table gets full, soft lockup happens. This is because the nf_conntrack_lock is held while nf_conntrack_alloc is called, which is in turn wants to lock nf_conntrack_lock while evicting entries from the full table. The patch fixes the soft lockup with limiting the holding of the nf_conntrack_lock to the minimum, where it's absolutely required. It required to extend (and thus change) nf_conntrack_hash_insert so that it makes sure conntrack and ctnetlink do not add the same entry twice to the conntrack table. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include')
-rw-r--r--include/net/netfilter/nf_conntrack.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 8a2b0ae7dbd2..ab86036bbf0c 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -209,7 +209,7 @@ extern struct nf_conntrack_tuple_hash *
__nf_conntrack_find(struct net *net, u16 zone,
const struct nf_conntrack_tuple *tuple);
-extern void nf_conntrack_hash_insert(struct nf_conn *ct);
+extern int nf_conntrack_hash_check_insert(struct nf_conn *ct);
extern void nf_ct_delete_from_lists(struct nf_conn *ct);
extern void nf_ct_insert_dying_list(struct nf_conn *ct);