diff options
| author | Zhuang Jin Can <jin.can.zhuang@intel.com> | 2014-09-03 14:26:34 +0800 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2014-09-03 15:15:55 -0500 |
| commit | fdee4ebac96bb44c9c488fdd830b7cc831cd295d (patch) | |
| tree | d54527d09c12328d1836648a58a55990c10df36f /drivers/usb/dwc3 | |
| parent | 9ce9ec95fb9b82e09b55a52f1bb8a362bf8f74d8 (diff) | |
usb: dwc3: gadget: Fix desc NULL pointer in dwc3_gadget_ep_queue()
dep->endpoint.desc is checked at the beginning of
dwc3_gadget_ep_queue(), but after that it may be set to NULL
by another thread and then accessed again in dwc3_gadget_ep_queue().
This will lead to kernel oops.
Expand spinlock protection area to aviod race condition.
Signed-off-by: Zhuang Jin Can <jin.can.zhuang@intel.com>
Signed-off-by: Jiebing Li <jiebing.li@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc3')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 349cacc577d8..e8fb231630f7 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1225,16 +1225,17 @@ static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, int ret; + spin_lock_irqsave(&dwc->lock, flags); if (!dep->endpoint.desc) { dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n", request, ep->name); + spin_unlock_irqrestore(&dwc->lock, flags); return -ESHUTDOWN; } dev_vdbg(dwc->dev, "queing request %p to %s length %d\n", request, ep->name, request->length); - spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_ep_queue(dep, req); spin_unlock_irqrestore(&dwc->lock, flags); |