linux-kernel - [PATCH 3.10 169/173] netfilter: nf_conntrack: use RCU safe kfree for conntrack extensions

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Date:	Mon,  2 Dec 2013 11:12:32 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michal Kubecek <mkubecek@...e.cz>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 3.10 169/173] netfilter: nf_conntrack: use RCU safe kfree for conntrack extensions

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michal Kubecek <mkubecek@...e.cz>

commit c13a84a830a208fb3443628773c8ca0557773cc7 upstream.

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@...e.cz>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/net/netfilter/nf_conntrack_extend.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/netfilter/nf_conntrack_extend.h
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -80,7 +80,7 @@ static inline void nf_ct_ext_destroy(str
 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. */


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