[3.16.y-ckt stable] Patch "net: sun4i-emac: fix memory leak on bad packet" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    net: sun4i-emac: fix memory leak on bad packet

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt3.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 187859900bfde1098ad7bf30c869e9df22b8d8b3 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier at arm.com>
Date: Tue, 5 Aug 2014 16:44:39 +0100
Subject: net: sun4i-emac: fix memory leak on bad packet

commit 2670cc699a66c4cf268cb3e3f6dfc325ec14f224 upstream.

Upon reception of a new frame, the emac driver checks for a number
of error conditions, and flag the packet as "bad" if any of these
are present. It then allocates a skb unconditionally, but only uses
it if the packet is "good". On the error path, the skb is just forgotten,
and the system leaks memory.

The piece of junk I have on my desk seems to encounter such error
frequently enough so that the box goes OOM after a couple of days,
which makes me grumpy.

Fix this by moving the allocation on the "good_packet" path (and
convert it to netdev_alloc_skb while we're at it).

Tested on a random Allwinner A20 board.

Cc: Stefan Roese <sr at denx.de>
Cc: Maxime Ripard <maxime.ripard at free-electrons.com>
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
Acked-by: Maxime Ripard <maxime.ripard at free-electrons.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index d81e7167a8b5..29b9f082475d 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -633,8 +633,10 @@ static void emac_rx(struct net_device *dev)
 		}

 		/* Move data from EMAC */
-		skb = dev_alloc_skb(rxlen + 4);
-		if (good_packet && skb) {
+		if (good_packet) {
+			skb = netdev_alloc_skb(dev, rxlen + 4);
+			if (!skb)
+				continue;
 			skb_reserve(skb, 2);
 			rdptr = (u8 *) skb_put(skb, rxlen - 4);