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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-03-27 13:53:52 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-03-28 02:48:35 +0400 |
| commit | 94f826b8076e2cb92242061e92f21b5baa3eccc2 (patch) | |
| tree | bb9893bf45ef93842a315b5ed8287ae1f11ae41b | |
| parent | 50269e19ad990e79eeda101fc6df80cffd5d4831 (diff) | |
| download | linux-94f826b8076e2cb92242061e92f21b5baa3eccc2.tar.xz | |
net: fix a potential rcu_read_lock() imbalance in rt6_fill_node()
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 <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>
| -rw-r--r-- | net/ipv6/route.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 24c456e8aa1d..496b62712fe8 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -2474,8 +2474,12 @@ static int rt6_fill_node(struct net *net, rcu_read_lock(); n = dst_get_neighbour_noref(&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) |