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

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Message-ID: <20070904110651.GB5126@kernel.dk>
Date:	Tue, 4 Sep 2007 13:06:51 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Micah Gruber <micah.gruber@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net, gregkh@...e.de
Subject: Re: [PATCH] Fix a potential NULL pointer dereference in
	usbat_check_status()  in drivers/usb/storage/shuttle_usbat.c

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).

-- 
Jens Axboe

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