From: Liping Zhang <liping.zh...@spreadtrum.com> User can add ct entry via nfnetlink(IPCTNL_MSG_CT_NEW), and if the total number reach the nf_conntrack_max, we will try to drop some ct entries.
But in this case(the main function call path is ctnetlink_create_conntrack -> nf_conntrack_alloc -> early_drop), rcu_read_lock is not held, so race with hash resize will happen. Fixes: 242922a02717 ("netfilter: conntrack: simplify early_drop") Cc: Florian Westphal <f...@strlen.de> Signed-off-by: Liping Zhang <liping.zh...@spreadtrum.com> --- net/netfilter/nf_conntrack_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index e0e9c9a..2d46225 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -880,6 +880,7 @@ static noinline int early_drop(struct net *net, unsigned int _hash) struct hlist_nulls_head *ct_hash; unsigned hash, sequence, drops; + rcu_read_lock(); do { sequence = read_seqcount_begin(&nf_conntrack_generation); hash = scale_hash(_hash++); @@ -887,6 +888,8 @@ static noinline int early_drop(struct net *net, unsigned int _hash) } while (read_seqcount_retry(&nf_conntrack_generation, sequence)); drops = early_drop_list(net, &ct_hash[hash]); + rcu_read_unlock(); + if (drops) { NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops); return true; -- 2.5.5 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html