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

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Date:	Mon, 10 Aug 2015 13:30:33 +0530
From:	Shraddha Barke <shraddha.6596@...il.com>
To:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...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>, HPDD-discuss@...ts.01.org,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Cc:	Shraddha Barke <shraddha.6596@...il.com>
Subject: [PATCH 1/3] Staging: wilc1000: Remove null check before kfree

kfree on NULL pointer is a no-op.

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

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