netdev - [PATCH stable] ipv4: avoid passing NULL to inet_putpeer() in icmpv4_xrlim

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Date:	Fri, 7 Dec 2012 10:46:40 -0500 (EST)
From:	CAI Qian <caiqian@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Neal Cardwell <ncardwell@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH stable] ipv4: avoid passing NULL to inet_putpeer() in
 icmpv4_xrlim_allow()

David, this patch looks applicable for the stable releases.

>From Neal Cardwell <ncardwell@...gle.com>

inet_getpeer_v4() can return NULL under OOM conditions, and while
inet_peer_xrlim_allow() is OK with a NULL peer, inet_putpeer() will
crash.

This code path now uses the same idiom as the others from:
1d861aa4b3fb08822055345f480850205ffe6170 ("inet: Minimize use of
cached route inetpeer.").

Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>

Upstream-ID: e1a676424c290b1c8d757e3860170ac7ecd89af4
Stable-trees: 3.6.x
Signed-off-by: CAI Qian <caiqian@...hat.com>

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index f2eccd5..17ff9fd 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -257,7 +257,8 @@ static inline bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
 		struct inet_peer *peer = inet_getpeer_v4(net->ipv4.peers, fl4->daddr, 1);
 		rc = inet_peer_xrlim_allow(peer,
 					   net->ipv4.sysctl_icmp_ratelimit);
-		inet_putpeer(peer);
+		if (peer)
+			inet_putpeer(peer);
 	}
 out:
 	return rc;
--
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