4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Wahren stefan.wahren@i2se.com
commit dea39aca1d7aef1e2b95b07edeacf04cc8863a2e upstream.
The skb size calculation in lan78xx_tx_bh is in race with the start_xmit, which could lead to rare kernel oopses. So protect the whole skb walk with a spin lock. As a benefit we can unlink the skb directly.
This patch was tested on Raspberry Pi 3B+
Link: https://github.com/raspberrypi/linux/issues/2608 Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet") Cc: stable stable@vger.kernel.org Signed-off-by: Floris Bos bos@je-eigen-domein.nl Signed-off-by: Stefan Wahren stefan.wahren@i2se.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/usb/lan78xx.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -2964,6 +2964,7 @@ static void lan78xx_tx_bh(struct lan78xx pkt_cnt = 0; count = 0; length = 0; + spin_lock_irqsave(&tqp->lock, flags); for (skb = tqp->next; pkt_cnt < tqp->qlen; skb = skb->next) { if (skb_is_gso(skb)) { if (pkt_cnt) { @@ -2972,7 +2973,8 @@ static void lan78xx_tx_bh(struct lan78xx } count = 1; length = skb->len - TX_OVERHEAD; - skb2 = skb_dequeue(tqp); + __skb_unlink(skb, tqp); + spin_unlock_irqrestore(&tqp->lock, flags); goto gso_skb; }
@@ -2981,6 +2983,7 @@ static void lan78xx_tx_bh(struct lan78xx skb_totallen = skb->len + roundup(skb_totallen, sizeof(u32)); pkt_cnt++; } + spin_unlock_irqrestore(&tqp->lock, flags);
/* copy to a single skb */ skb = alloc_skb(skb_totallen, GFP_ATOMIC);