linux-kernel - [PATCH 3.18 01/32] usb: gadget: inode.c: fix unbalanced spin_lock in ep0

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Date:   Tue, 10 Oct 2017 21:50:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Eccher <d.eccher@...il.com>,
        Felipe Balbi <balbi@...com>
Subject: [PATCH 3.18 01/32] usb: gadget: inode.c: fix unbalanced spin_lock in ep0_write

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Eccher <d.eccher@...il.com>

commit b7bd98b7db9fc8fe19da1a5ff0215311c6b95e46 upstream.

Fix bad unlock balance: ep0_write enter with the locks locked from
inode.c:1769, hence it must exit with spinlock held to avoid double
unlock in dev_config.

Signed-off-by: David Eccher <d.eccher@...il.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/legacy/inode.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1224,10 +1224,9 @@ ep0_write (struct file *fd, const char _
 						dev->gadget->ep0, dev->req,
 						GFP_KERNEL);
 				}
+				spin_lock_irq(&dev->lock);
 				if (retval < 0) {
-					spin_lock_irq (&dev->lock);
 					clean_req (dev->gadget->ep0, dev->req);
-					spin_unlock_irq (&dev->lock);
 				} else
 					retval = len;