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netfilter: nf_conntrack: use RCU safe kfree for conntrack extensions

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Commit 68b80f11 (netfilter: nf_nat: fix RCU races) introduced
RCU protection for freeing extension data when reallocation
moves them to a new location. We need the same protection when
freeing them in nf_ct_ext_free() in order to prevent a
use-after-free by other threads referencing a NAT extension data
via bysource list.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Michal Kubeček 2013-09-11 10:17:27 +02:00 committed by Pablo Neira Ayuso
parent c19d65c95c
commit c13a84a830
1 changed files with 1 additions and 1 deletions
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2
include/net/netfilter/nf_conntrack_extend.h
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@ -86,7 +86,7 @@ static inline void nf_ct_ext_destroy(struct nf_conn *ct)
static inline void nf_ct_ext_free(struct nf_conn *ct)
{
if (ct->ext)
kfree(ct->ext);
kfree_rcu(ct->ext, rcu);
}
/* Add this type, returns pointer to data or NULL. */