From e033155d0b495becfdc28f46ad20089dc8a13060 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 27 Mar 2012 09:53:52 +0000 Subject: net: fix a potential rcu_read_lock() imbalance in rt6_fill_node() [ Upstream commit 94f826b8076e2cb92242061e92f21b5baa3eccc2 ] Commit f2c31e32b378 (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 Reported-by: Dave Jones Signed-off-by: Eric Dumazet Tested-by: Ben Greear Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/route.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/ipv6/route.c b/net/ipv6/route.c index e70e902a5d06..8e600f827fe7 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -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) -- cgit v1.2.3