tree 570d7079252a6a7b821e42383913ec0bfa09e4eb
parent ec6d67e39f5638c792eb7490bf32586ccb9d8005
author Alan Stern <stern@rowland.harvard.edu> 1246287894 -0400
committer Greg Kroah-Hartman <gregkh@suse.de> 1247437001 -0700

USB: handle zero-length usbfs submissions correctly

This patch (as1262) fixes a bug in usbfs: It refuses to accept
zero-length transfers, and it insists that the buffer pointer be valid
even if there is no data being transferred.

The patch also consolidates a bunch of repetitive access_ok() checks
into a single check, which incidentally fixes the lack of such a check
for Isochronous URBs.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>