linux-kernel - [PATCH] netlink: Fix kfree NULL pointer

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Message-ID: <AANLkTikp0m8cQYfEBHP_E8XpGZqdMj6Cr4M=aWCnei=X@mail.gmail.com>
Date:	Wed, 8 Sep 2010 13:13:57 +0800
From:	jovi zhang <bookjovi@...il.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Johannes Berg <johannes.berg@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...nvz.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] netlink: Fix kfree NULL pointer

It will kfree NULL pointer if listeners is NULL. fix it.

Signed-off-by: bookjovi@...il.com
net/netlink/af_netlink.c |    5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 980fe4a..1c7bf48 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1532,8 +1532,10 @@ netlink_kernel_create(struct net *net, int
unit, unsigned int groups,
       if (input)
               nlk_sk(sk)->netlink_rcv = input;

-       if (netlink_insert(sk, net, 0))
+       if (netlink_insert(sk, net, 0)) {
+               kfree(listeners);
               goto out_sock_release;
+       }

       nlk = nlk_sk(sk);
       nlk->flags |= NETLINK_KERNEL_SOCKET;
@@ -1553,7 +1555,6 @@ netlink_kernel_create(struct net *net, int unit,
unsigned int groups,
       return sk;

out_sock_release:
-       kfree(listeners);
       netlink_kernel_release(sk);
       return NULL;
--
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