linux-kernel - [PATCH 3.2 58/94] appletalk: Fix socket referencing in skb

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Message-ID: <lsq.1407170912.956215747@decadent.org.uk>
Date:	Mon, 04 Aug 2014 17:48:32 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Andrey Utkin" <andrey.krieger.utkin@...il.com>,
	"Ed Martin" <edman007@...an007.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric Dumazet" <edumazet@...gle.com>
Subject: [PATCH 3.2 58/94] appletalk: Fix socket referencing in skb

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Andrey Utkin <andrey.krieger.utkin@...il.com>

[ Upstream commit 36beddc272c111689f3042bf3d10a64d8a805f93 ]

Setting just skb->sk without taking its reference and setting a
destructor is invalid. However, in the places where this was done, skb
is used in a way not requiring skb->sk setting. So dropping the setting
of skb->sk.
Thanks to Eric Dumazet <eric.dumazet@...il.com> for correct solution.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=79441
Reported-by: Ed Martin <edman007@...an007.com>
Signed-off-by: Andrey Utkin <andrey.krieger.utkin@...il.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/appletalk/ddp.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 334d4cd..79aaac2 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1494,8 +1494,6 @@ static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
 		goto drop;
 
 	/* Queue packet (standard) */
-	skb->sk = sock;
-
 	if (sock_queue_rcv_skb(sock, skb) < 0)
 		goto drop;
 
@@ -1649,7 +1647,6 @@ static int atalk_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr
 	if (!skb)
 		goto out;
 
-	skb->sk = sk;
 	skb_reserve(skb, ddp_dl->header_length);
 	skb_reserve(skb, dev->hard_header_len);
 	skb->dev = dev;

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