linux-kernel - [PATCH] usb-gadget: unlock data->lock mutex on error path in ep

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Date:	Sat, 5 Mar 2011 01:54:50 +0300 (MSK)
From:	"Alexey Khoroshilov" <khoroshilov@...ras.ru>
To:	"David Brownell" <dbrownell@...rs.sourceforge.net>
Cc:	"Greg Kroah-Hartman" <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] usb-gadget: unlock data->lock mutex on error path in 
     ep_read()

ep_read() acquires data->lock mutex in get_ready_ep() and releases it on
all paths except for one: when usb_endpoint_xfer_isoc() failed. The patch
adds mutex_unlock(&data->lock) at that path.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/usb/gadget/inode.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 3ed73f4..a01383f 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -386,8 +386,10 @@ ep_read (struct file *fd, char __user *buf, size_t
len, loff_t *ptr)

        /* halt any endpoint by doing a "wrong direction" i/o call */
        if (usb_endpoint_dir_in(&data->desc)) {
-               if (usb_endpoint_xfer_isoc(&data->desc))
+               if (usb_endpoint_xfer_isoc(&data->desc)) {
+                       mutex_unlock(&data->lock);
                        return -EINVAL;
+               }
                DBG (data->dev, "%s halt\n", data->name);
                spin_lock_irq (&data->dev->lock);
                if (likely (data->ep != NULL))
-- 
1.7.0.4

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