linux-kernel - Re: [PATCH 1/3] Staging: wilc1000: Remove null check before kfree

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Message-ID: <D1EE904E.100897%andreas.dilger@intel.com>
Date:	Mon, 10 Aug 2015 23:30:58 +0000
From:	"Dilger, Andreas" <andreas.dilger@...el.com>
To:	Shraddha Barke <shraddha.6596@...il.com>,
	"Drokin, Oleg" <oleg.drokin@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Benjamin Romer <benjamin.romer@...sys.com>,
	Johnny Kim <johnny.kim@...el.com>,
	Rachel Kim <rachel.kim@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] Staging: wilc1000: Remove null check before kfree

On 2015/08/10, 2:00 AM, "Shraddha Barke" <shraddha.6596@...il.com> wrote:

>kfree on NULL pointer is a no-op.

Hi, please don't CC the hpdd-discuss list, nor Oleg or I for patches
unrelated to Lustre.

Cheers, Andreas

>This patch uses the following semantic patch to find such an instance
>where NULL check is present before kfree.
>
>// <smpl>
>@@ expression E; @@
>- if (E != NULL) { kfree(E); }
>+ kfree(E);
>@@ expression E; @@
>- if (E != NULL) { kfree(E); E = NULL; }
>+ kfree(E);
>+ E = NULL;
>// </smpl>smpl>
>
>Signed-off-by: Shraddha Barke <shraddha.6596@...il.com>
>---
> drivers/staging/wilc1000/linux_wlan.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
>diff --git a/drivers/staging/wilc1000/linux_wlan.c
>b/drivers/staging/wilc1000/linux_wlan.c
>index 3e55a8a..3dcd6e5 100644
>--- a/drivers/staging/wilc1000/linux_wlan.c
>+++ b/drivers/staging/wilc1000/linux_wlan.c
>@@ -2343,8 +2343,7 @@ int mac_ioctl(struct net_device *ndev, struct ifreq
>*req, int cmd)
> 
> done:
> 
>-	if (buff != NULL)
>-		kfree(buff);
>+	kfree(buff);
> 
> 	return s32Error;
> }
>-- 
>2.1.0
>
>


Cheers, Andreas
-- 
Andreas Dilger

Lustre Software Architect
Intel High Performance Data Division


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