linux-kernel - [39/63] USB: Do not pass negative length to snoop

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Date:	Fri, 25 Mar 2011 16:44:15 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Michal Sojka <sojkam1@....cvut.cz>
Subject: [39/63] USB: Do not pass negative length to snoop_urb()

2.6.38-stable review patch.  If anyone has any objections, please let us know.

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

From: Michal Sojka <sojkam1@....cvut.cz>

commit 9d02b42614149ebccf12c9c580601ed01bd83070 upstream.

When `echo Y > /sys/module/usbcore/parameters/usbfs_snoop` and
usb_control_msg() returns error, a lot of kernel memory is dumped to dmesg
until unhandled kernel paging request occurs.

Signed-off-by: Michal Sojka <sojkam1@....cvut.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/core/devio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -802,7 +802,7 @@ static int proc_control(struct dev_state
 				    tbuf, ctrl.wLength, tmo);
 		usb_lock_device(dev);
 		snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
-			tbuf, i);
+			  tbuf, max(i, 0));
 		if ((i > 0) && ctrl.wLength) {
 			if (copy_to_user(ctrl.data, tbuf, i)) {
 				free_page((unsigned long)tbuf);


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