linux-kernel - [32/54] USB: resizing usbmon binary interface buffer causes protection faults

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Message-Id: <20100812000126.182641316@clark.site>
Date:	Wed, 11 Aug 2010 17:00:47 -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,
	Steven Robertson <steven@...obe.cc>,
	Pete Zaitcev <zaitcev@...hat.com>
Subject: [32/54] USB: resizing usbmon binary interface buffer causes protection faults

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

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

From: Steven Robertson <steven@...obe.cc>

commit 33d973ad88ceb83ed1449592b7574b5b5bb33ac6 upstream.

Enlarging the buffer size via the MON_IOCT_RING_SIZE ioctl causes
general protection faults. It appears the culprit is an incorrect
argument to mon_free_buff: instead of passing the size of the current
buffer being freed, the size of the new buffer is passed.

Use the correct size argument to mon_free_buff when changing the size of
the buffer.

Signed-off-by: Steven Robertson <steven@...obe.cc>
Acked-by: Pete Zaitcev <zaitcev@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -1010,7 +1010,7 @@ static int mon_bin_ioctl(struct inode *i
 
 		mutex_lock(&rp->fetch_lock);
 		spin_lock_irqsave(&rp->b_lock, flags);
-		mon_free_buff(rp->b_vec, size/CHUNK_SIZE);
+		mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE);
 		kfree(rp->b_vec);
 		rp->b_vec  = vec;
 		rp->b_size = size;


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