summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorStefan Wahren <stefan.wahren@i2se.com>2018-07-15 21:53:20 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-22 14:27:39 +0200
commitf6ed63bc39e08fe761f9d100937d01fba9b098c1 (patch)
tree9412490ccd2e8916f62206da451787049f929fb8
parent254f52df9b1ecbd0ee2a9f31b506924cb61ca850 (diff)
net: lan78xx: Fix race in tx pending skb size calculation
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>
-rw-r--r--drivers/net/usb/lan78xx.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index f5a96678494b..5e0626c80b81 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2964,6 +2964,7 @@ static void lan78xx_tx_bh(struct lan78xx_net *dev)
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_net *dev)
}
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_net *dev)
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);