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-rw-r--r--net/netfilter/nf_conntrack_core.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index b83c530c5e0a..eeeb8bc73982 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -424,6 +424,16 @@ __nf_conntrack_confirm(struct sk_buff *skb)
spin_lock_bh(&nf_conntrack_lock);
+ /* We have to check the DYING flag inside the lock to prevent
+ a race against nf_ct_get_next_corpse() possibly called from
+ user context, else we insert an already 'dead' hash, blocking
+ further use of that particular connection -JM */
+
+ if (unlikely(nf_ct_is_dying(ct))) {
+ spin_unlock_bh(&nf_conntrack_lock);
+ return NF_ACCEPT;
+ }
+
/* See if there's one in the list already, including reverse:
NAT could have grabbed it without realizing, since we're
not in the hash. If there is, we lost race. */