netdev - [PATCH net v2] adding missing rcu_read_unlock in ipxip6

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Message-Id: <20171207011543.2877447-1-tehnerd@fb.com>
Date:   Wed,  6 Dec 2017 17:15:43 -0800
From:   "Nikita V. Shirokov" <tehnerd@...com>
To:     netdev <netdev@...r.kernel.org>
Cc:     ast@...nel.org, vnuorval@....hut.fi,
        "Nikita V. Shirokov" <tehnerd@...com>
Subject: [PATCH net v2] adding missing rcu_read_unlock in ipxip6_rcv

commit 8d79266bc48c ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
introduced new exit point in  ipxip6_rcv. however rcu_read_unlock is
missing there. this diff is fixing this

v1->v2:
 instead of doing rcu_read_unlock in place, we are going to "drop"
 section (to prevent skb leakage)

Signed-off-by: Nikita V. Shirokov <tehnerd@...com>
---
 net/ipv6/ip6_tunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 3d3092a..db84f52 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -904,7 +904,7 @@ static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
 		if (t->parms.collect_md) {
 			tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
 			if (!tun_dst)
-				return 0;
+				goto drop;
 		}
 		ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
 				    log_ecn_error);
-- 
2.9.5