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From linux-usb-owner@vger.kernel.org Thu Jul 22 15:57:03 2010
Message-ID: <4C475AD4.8090000@strobe.cc>
Date: Wed, 21 Jul 2010 16:38:44 -0400
From: Steven Robertson <steven@strobe.cc>
To: linux-usb@vger.kernel.org, greg@kroah.com
Subject: USB: resizing usbmon binary interface buffer causes protection faults
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@strobe.cc>
Acked-by: Pete Zaitcev <zaitcev@redhat.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.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
@@ -1004,7 +1004,7 @@ static long mon_bin_ioctl(struct file *f
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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