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

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Date:	Fri, 27 May 2011 08:37:40 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
CC:	Greg KH <greg@...ah.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb-gadget: unlock data->lock mutex on error path in
 ep_write()

On 05/26/2011 01:59 PM, Sergei Shtylyov wrote:
>> It is similar to commit 00cc7a5faf25b3ba5cf30fcffc62249bdd152006 for
>> ep_read(),
> 
>    Please specify that commit's summary in parens.

Done. Thank you.


ep_write() 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.

It is similar to commit 00cc7a5 ("usb-gadget: unlock data->lock mutex on error path in ep_read()"),
it was not fixed at that time by accident.

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 a01383f..a56876a 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -431,8 +431,10 @@ ep_write (struct file *fd, const 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))
-- 1.7.4.1 
--
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