linux-kernel - Re: [PATCH 9/10] drivers/mmc: Move a dereference below a NULL test

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Message-ID: <20090720134736.605f86d1@lxorguk.ukuu.org.uk>
Date:	Mon, 20 Jul 2009 13:47:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Adrian Hunter <adrian.hunter@...ia.com>
Cc:	arun c <arun.edarath@...il.com>, Julia Lawall <julia@...u.dk>,
	"Lavinen Jarkko (Nokia-D/Helsinki)" <jarkko.lavinen@...ia.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH 9/10] drivers/mmc: Move a dereference below a NULL test

> It is not a "NULL check" it is an assertion, which can be compiled out.
> On some platforms BUG is implemented as a null dereference anyway
> e.g. on ARM  it is *(int *)0 = 0;

It's a bogus check because the 

struct mmc_omap_host *host = slot->host;

has already been executed before you check for slot == NULL

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