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USB: fix race leading to use after free in io_edgeport 

usb_unlink_urb() is asynchronous, therefore an URB's buffer may not
be freed without waiting for the completion handler. This patch switches
to usb_kill_urb(), which is synchronous.
Thanks to Alan for making me look at the remaining users of usb_unlink_urb()


Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Al Borchers <alborchers@steinerpoint.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-06-13 18:50:41 +02:00 committed by Greg Kroah-Hartman
parent 5afeb104e7
commit 74ac07e8b8
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/serial/io_edgeport.c
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@ -3046,11 +3046,11 @@ static void edge_shutdown (struct usb_serial *serial)
}
/* free up our endpoint stuff */
if (edge_serial->is_epic) {
usb_unlink_urb(edge_serial->interrupt_read_urb);
usb_kill_urb(edge_serial->interrupt_read_urb);
usb_free_urb(edge_serial->interrupt_read_urb);
kfree(edge_serial->interrupt_in_buffer);
usb_unlink_urb(edge_serial->read_urb);
usb_kill_urb(edge_serial->read_urb);
usb_free_urb(edge_serial->read_urb);
kfree(edge_serial->bulk_in_buffer);
}