linux-kernel - Re: [PATCH] net/xfrm: Use an IS_ERR test rather than a NULL test

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Date:	Tue, 02 Sep 2008 17:24:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	brunel@...u.dk
Cc:	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net/xfrm: Use an IS_ERR test rather than a NULL test

From: Julien Brunel <brunel@...u.dk>
Date: Mon, 1 Sep 2008 10:53:33 +0200

> In case of error, the function xfrm_bundle_create returns an ERR
> pointer, but never returns a NULL pointer. So a NULL test that comes
> after an IS_ERR test should be deleted.
> 
> The semantic match that finds this problem is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @match_bad_null_test@
> expression x, E;
> statement S1,S2;
> @@
> x =  xfrm_bundle_create(...)
> ... when != x = E
> *  if (x != NULL) 
> S1 else S2
> // </smpl>
> 
> Signed-off-by:  Julien Brunel <brunel@...u.dk>
> Signed-off-by:  Julia Lawall <julia@...u.dk>

Looks good, patch applied, thanks.
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