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usb: gadget: NCM: Protect dev->port_usb using dev->lock

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This commit incorporates findings from
https://lkml.org/lkml/2016/4/25/594

The function has been modified to make sure we hold
the dev lock when accessing the net device pointer.

Acked-by: Jim Baxter <jim_baxter@mentor.com>
Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Harish Jenny K N 2016-09-09 11:30:42 +02:00 committed by Felipe Balbi
parent 79775f4418
commit c9ffc78745
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/gadget/function/u_ether.c
View file

@ -553,14 +553,16 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
spin_lock_irqsave(&dev->lock, flags);
if (dev->port_usb)
skb = dev->wrap(dev->port_usb, skb);
spin_unlock_irqrestore(&dev->lock, flags);
if (!skb) {
/* Multi frame CDC protocols may store the frame for
* later which is not a dropped frame.
*/
if (dev->port_usb &&
dev->port_usb->supports_multi_frame)
dev->port_usb->supports_multi_frame) {
spin_unlock_irqrestore(&dev->lock, flags);
goto multiframe;
}
spin_unlock_irqrestore(&dev->lock, flags);
goto drop;
}
}
@ -578,6 +580,7 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
req->zero = 0;
else
req->zero = 1;
spin_unlock_irqrestore(&dev->lock, flags);
/* use zlp framing on tx for strict CDC-Ether conformance,
* though any robust network rx path ignores extra padding.