This is a note to let you know that I've just added the patch titled

smsc75xx: use skb_cow_head() to deal with cloned skbs

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: smsc75xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From b7c6d2675899cfff0180412c63fc9cbd5bacdb4d Mon Sep 17 00:00:00 2001

From: Eric Dumazet edumazet@google.com Date: Wed, 19 Apr 2017 09:59:21 -0700 Subject: smsc75xx: use skb_cow_head() to deal with cloned skbs

From: Eric Dumazet edumazet@google.com

commit b7c6d2675899cfff0180412c63fc9cbd5bacdb4d upstream.

We need to ensure there is enough headroom to push extra header, but we also need to check if we are allowed to change headers.

skb_cow_head() is the proper helper to deal with this.

Fixes: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver") Signed-off-by: Eric Dumazet edumazet@google.com Cc: James Hughes james.hughes@raspberrypi.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Oliver Neukum oneukum@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/net/usb/smsc75xx.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/drivers/net/usb/smsc75xx.c +++ b/drivers/net/usb/smsc75xx.c @@ -2193,13 +2193,9 @@ static struct sk_buff *smsc75xx_tx_fixup { u32 tx_cmd_a, tx_cmd_b;

- if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) { - struct sk_buff *skb2 = - skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags); + if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) { dev_kfree_skb_any(skb); - skb = skb2; - if (!skb) - return NULL; + return NULL; }

tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;

Patches currently in stable-queue which might be from edumazet@google.com are

queue-4.4/lan78xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch queue-4.4/cx82310_eth-use-skb_cow_head-to-deal-with-cloned-skbs.patch queue-4.4/sr9700-use-skb_cow_head-to-deal-with-cloned-skbs.patch queue-4.4/smsc75xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch