linux-kernel - Re: [linux-usb-devel] [PATCH] Fix a potential NULL pointer dereference in usbat_check_status() in drivers/usb/storage/shuttle

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Message-ID: <Pine.LNX.4.44L0.0709041657460.7853-100000@iolanthe.rowland.org>
Date:	Tue, 4 Sep 2007 16:58:33 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Simon Holm Thøgersen <odie@...aau.dk>
cc:	Jens Axboe <jens.axboe@...cle.com>, <gregkh@...e.de>,
	<linux-kernel@...r.kernel.org>,
	Micah Gruber <micah.gruber@...il.com>,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] [PATCH] Fix a potential NULL pointer dereference
 in usbat_check_status() in drivers/usb/storage/shuttle_usbat.c

On Tue, 4 Sep 2007, Simon Holm Thøgersen wrote:

> > tir, 04 09 2007 kl. 13:06 +0200, skrev Jens Axboe:
> > On Tue, Sep 04 2007, Micah Gruber wrote:
> > > This patch fixes a potential null dereference bug where we dereference us before a null check. This patch simply moves the dereferencing after the null check.
> > > 
> > > Signed-off-by: Micah Gruber <micah.gruber@...il.com>
> > 
> > Be careful with stuff like that, if you actually look at the code, a us
> > == NULL doesn't seem to be possible (or usbat_flash_transport() would
> > have oopsed before).
> > 
> If that is true, then
>         if (!us)
>                 return USB_STOR_TRANSPORT_ERROR;
> is utterly pointless.

Indeed, so it is.

Alan Stern

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