netdev - [PATCH 17/18] netfilter: nfnetlink: check callbacks before using those in nfnetlink_rcv

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Date:	Fri,  6 Jul 2012 13:17:07 +0200
From:	pablo@...filter.org
To:	netfilter-devel@...r.kernel.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 17/18] netfilter: nfnetlink: check callbacks before using those in nfnetlink_rcv_msg

From: Tomasz Bursztyka <tomasz.bursztyka@...ux.intel.com>

nfnetlink_rcv_msg() might call a NULL callback which will cause NULL pointer
dereference.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@...ux.intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nfnetlink.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 3e797d1..4acdd76 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -184,9 +184,11 @@ replay:
 					lockdep_is_held(&nfnl_mutex)) != ss ||
 			    nfnetlink_find_client(type, ss) != nc)
 				err = -EAGAIN;
-			else
+			else if (nc->call)
 				err = nc->call(net->nfnl, skb, nlh,
 						   (const struct nlattr **)cda);
+			else
+				err = -EINVAL;
 			nfnl_unlock();
 		}
 		if (err == -EAGAIN)
-- 
1.7.10

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