linux-kernel - [PATCH 4.4 008/118] tipc: move linearization of buffers to generic code

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Date:   Thu, 22 Sep 2016 19:28:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ying Xue <ying.xue@...driver.com>,
        Jon Maloy <jon.maloy@...csson.com>,
        "David S. Miller" <davem@...emloft.net>,
        Juerg Haefliger <juerg.haefliger@....com>
Subject: [PATCH 4.4 008/118] tipc: move linearization of buffers to generic code

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Jon Paul Maloy <jon.maloy@...csson.com>

commit c7cad0d6f70cd4ce8644ffe528a4df1cdc2e77f5 upstream.

In commit 5cbb28a4bf65c7e4 ("tipc: linearize arriving NAME_DISTR
and LINK_PROTO buffers") we added linearization of NAME_DISTRIBUTOR,
LINK_PROTOCOL/RESET and LINK_PROTOCOL/ACTIVATE to the function
tipc_udp_recv(). The location of the change was selected in order
to make the commit easily appliable to 'net' and 'stable'.

We now move this linearization to where it should be done, in the
functions tipc_named_rcv() and tipc_link_proto_rcv() respectively.

Reviewed-by: Ying Xue <ying.xue@...driver.com>
Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Juerg Haefliger <juerg.haefliger@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/tipc/link.c       |    2 ++
 net/tipc/name_distr.c |    1 +
 net/tipc/udp_media.c  |    5 -----
 3 files changed, 3 insertions(+), 5 deletions(-)

--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1262,6 +1262,8 @@ static int tipc_link_proto_rcv(struct ti
 		/* fall thru' */

 	case ACTIVATE_MSG:
+		skb_linearize(skb);
+		hdr = buf_msg(skb);

 		/* Complete own link name with peer's interface name */
 		if_name =  strrchr(l->name, ':') + 1;
--- a/net/tipc/name_distr.c
+++ b/net/tipc/name_distr.c
@@ -397,6 +397,7 @@ void tipc_named_rcv(struct net *net, str

 	spin_lock_bh(&tn->nametbl_lock);
 	for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) {
+		skb_linearize(skb);
 		msg = buf_msg(skb);
 		mtype = msg_type(msg);
 		item = (struct distr_item *)msg_data(msg);
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -48,7 +48,6 @@
 #include <linux/tipc_netlink.h>
 #include "core.h"
 #include "bearer.h"
-#include "msg.h"

 /* IANA assigned UDP port */
 #define UDP_PORT_DEFAULT	6118
@@ -224,10 +223,6 @@ static int tipc_udp_recv(struct sock *sk
 {
 	struct udp_bearer *ub;
 	struct tipc_bearer *b;
-	int usr = msg_user(buf_msg(skb));
-
-	if ((usr == LINK_PROTOCOL) || (usr == NAME_DISTRIBUTOR))
-		skb_linearize(skb);

 	ub = rcu_dereference_sk_user_data(sk);
 	if (!ub) {