From: Alan Stern <stern@rowland.harvard.edu>
Date: Mon, 29 Jun 2009 15:04:54 +0000 (-0400)
Subject: USB: handle zero-length usbfs submissions correctly
X-Git-Tag: v2.6.27.29~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a9b8d3bae0dfe231e244e3b1952886248bd683e;p=pandora-kernel.git

USB: handle zero-length usbfs submissions correctly

commit 9180135bc80ab11199d482b6111e23f74d65af4a upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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