linux-kernel - [PATCH 4/6] usb: gadget: mv_udc: check endpoint before queue dtd

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Date:	Mon, 24 Feb 2014 16:03:14 +0800
From:	Neil Zhang <zhangwm@...vell.com>
To:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Neil Zhang <zhangwm@...vell.com>
Subject: [PATCH 4/6] usb: gadget: mv_udc: check endpoint before queue dtd

There is a corner case that endpoint is disabled by system shutdown
between check ep->desc and hold spin lock in mv_ep_queue. In this
case ep->ep.desc will be NULL and occur kernel panic when access
it in build_dtd.

Signed-off-by: Neil Zhang <zhangwm@...vell.com>
---
 drivers/usb/gadget/mv_udc_core.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/usb/gadget/mv_udc_core.c b/drivers/usb/gadget/mv_udc_core.c
index d5a9bdf..a620cff 100644
--- a/drivers/usb/gadget/mv_udc_core.c
+++ b/drivers/usb/gadget/mv_udc_core.c
@@ -734,6 +734,14 @@ mv_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 
 	spin_lock_irqsave(&udc->lock, flags);
 
+	if (!ep->ep.desc) {
+		spin_unlock_irqrestore(&udc->lock, flags);
+		dev_info(&udc->dev->dev,
+			"%s is already disabled!\n", ep->name);
+		retval = -EINVAL;
+		goto err_unmap_dma;
+	}
+
 	/* build dtds and push them to device queue */
 	if (!req_to_dtd(req)) {
 		retval = queue_dtd(ep, req);
-- 
1.7.9.5

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