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| author | Stefan Wahren <stefan.wahren@i2se.com> | 2018-07-15 21:53:20 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-07-16 14:12:56 -0700 |
| commit | dea39aca1d7aef1e2b95b07edeacf04cc8863a2e (patch) | |
| tree | db097b90902be7acd610d3064edea3f10b67c826 | |
| parent | b5d2d75e079a918be686957b1a8d2f6c5cc95a0a (diff) | |
| download | linux-stable-dea39aca1d7aef1e2b95b07edeacf04cc8863a2e.tar.gz linux-stable-dea39aca1d7aef1e2b95b07edeacf04cc8863a2e.tar.bz2 linux-stable-dea39aca1d7aef1e2b95b07edeacf04cc8863a2e.zip | |
net: lan78xx: Fix race in tx pending skb size calculation
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>
| -rw-r--r-- | drivers/net/usb/lan78xx.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 2e4130746c40..ed10d49eb5e0 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -3344,6 +3344,7 @@ 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) { @@ -3352,7 +3353,8 @@ 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; } @@ -3361,6 +3363,7 @@ 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); |