[PATCH 3.13.y-ckt 85/86] netfilter: nfnetlink: don't probe module if it exists

[Kamal Mostafa]

3.13.11-ckt31 -stable review patch.  If anyone has any objections, please let me know.

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

From: Florian Westphal <fw@xxxxxxxxx>

commit dbc3617f4c1f9fcbe63612048cb9583fea1e11ab upstream.

nfnetlink_bind request_module()s all the time as nfnetlink_get_subsys()
shifts the argument by 8 to obtain the subsys id.

So using type instead of type << 8 always returns NULL.

Fixes: 03292745b02d11 ("netlink: add nlk->netlink_bind hook for module auto-loading")
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
 net/netfilter/nfnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 8be4810..0910c4b 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -397,7 +397,7 @@ static void nfnetlink_bind(int group)
 	int type = nfnl_group2type[group];
 
 	rcu_read_lock();
-	ss = nfnetlink_get_subsys(type);
+	ss = nfnetlink_get_subsys(type << 8);
 	if (!ss) {
 		rcu_read_unlock();
 		request_module("nfnetlink-subsys-%d", type);
-- 
1.9.1

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