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net: fix a potential rcu_read_lock() imbalance in rt6_fill_node()

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[ Upstream commit 94f826b807 ]

Commit f2c31e32b3 (net: fix NULL dereferences in check_peer_redir() )
added a regression in rt6_fill_node(), leading to rcu_read_lock()
imbalance.

Thats because NLA_PUT() can make a jump to nla_put_failure label.

Fix this by using nla_put()

Many thanks to Ben Greear for his help

Reported-by: Ben Greear <greearb@candelatech.com>
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet
2012-03-27 09:53:52 +00:00
committed by Greg Kroah-Hartman
parent 02241f8a5f
commit e033155d0b
1 changed files with 6 additions and 2 deletions
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8
net/ipv6/route.c
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@@ -2411,8 +2411,12 @@ static int rt6_fill_node(struct net *net,
rcu_read_lock();
n = dst_get_neighbour(&rt->dst);
if (n)
NLA_PUT(skb, RTA_GATEWAY, 16, &n->primary_key);
if (n) {
if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) {
rcu_read_unlock();
goto nla_put_failure;
}
}
rcu_read_unlock();
if (rt->dst.dev)