linux-kernel - Re: [PATCH] usb: use memdup

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Message-Id: <200905041601.51789.oliver@neukum.org>
Date:	Mon, 4 May 2009 16:01:51 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	David Brownell <david-b@...bell.net>
Cc:	Li Hong <lihong.hi@...il.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: use memdup_user()

Am Montag, 4. Mai 2009 09:02:38 schrieb David Brownell:
> On Sunday 03 May 2009, Oliver Neukum wrote:
> > No. To make it plain. To me any use of memdup_user() in USB code
> > is a bad idea. I don't want to have to think about a new primitive.
>
> Unless it's incorrect to use that, I have to say that it
> makes more sense to use that utility than recreate it by
> open-coding...

I want people to be forced to think about memory allocations.
We had endless trouble during 2.4 with storage deadlocking.
We simply need full control of this.

I prefer the explicite way for the same reason I prefer

if (rv < 0)
	goto err_out;

over

if (rv < 0)
	return rv;

In the former version you need to think about what you need to do
to cleanup.

	Regards
		Oliver

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