linux-kernel - [11/45] ax25: Fix possible oops in ax25_make

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Message-Id: <20100330224945.987478556@linux.site>
Date:	Tue, 30 Mar 2010 15:48:31 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jarek Poplawski <jarkao2@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [11/45] ax25: Fix possible oops in ax25_make_new

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jarek Poplawski <jarkao2@...il.com>

commit 8c185ab6185bf5e67766edb000ce428269364c86 upstream.

In ax25_make_new, if kmemdup of digipeat returns an error, there would
be an oops in sk_free while calling sk_destruct, because sk_protinfo
is NULL at the moment; move sk->sk_destruct initialization after this.

BTW of reported-by: Bernard Pidoux F6BVP <f6bvp@...e.fr>

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/ax25/af_ax25.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -894,7 +894,6 @@ struct sock *ax25_make_new(struct sock *
 
 	sock_init_data(NULL, sk);
 
-	sk->sk_destruct = ax25_free_sock;
 	sk->sk_type     = osk->sk_type;
 	sk->sk_priority = osk->sk_priority;
 	sk->sk_protocol = osk->sk_protocol;
@@ -932,6 +931,7 @@ struct sock *ax25_make_new(struct sock *
 	}
 
 	sk->sk_protinfo = ax25;
+	sk->sk_destruct = ax25_free_sock;
 	ax25->sk    = sk;
 
 	return sk;


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