netdev - [PATCH] ipv6: Fix 'inet6_rtm_getroute' to release 'rt->dst' in case of 'alloc

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Date:	Wed, 4 Apr 2012 12:13:00 +0300
From:	Shmulik Ladkani <shmulik.ladkani@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: [PATCH] ipv6: Fix 'inet6_rtm_getroute' to release 'rt->dst' in case
 of 'alloc_skb' failure

In 72331bc [ipv6: Fix RTM_GETROUTE's interpretation of RTA_IIF to be
consistent with ipv4] the code of 'inet6_rtm_getroute()' was re-ordered
such that the reference to 'rt->dst' is incremented prior skb
allocation.

Hence, if 'alloc_skb()' fails, must drop a reference from 'rt->dst'.
Add the missing 'dst_release()' call.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@...il.com>
---
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 1178345..00b987c 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2581,6 +2581,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
 
 	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 	if (!skb) {
+		dst_release(&rt->dst);
 		err = -ENOBUFS;
 		goto errout;
 	}
--
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