linux-kernel - [PATCH 4/4] drivers/net/wireless/mwifiex/scan.c: test the just-initialized value

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Message-Id: <1314021636-11528-4-git-send-email-julia@diku.dk>
Date:	Mon, 22 Aug 2011 16:00:36 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Bing Zhao <bzhao@...vell.com>
Cc:	kernel-janitors@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] drivers/net/wireless/mwifiex/scan.c: test the just-initialized value

From: Julia Lawall <julia@...u.dk>

Test the just-initialized value rather than some other one.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier x,y,f!={PTR_ERR,ERR_PTR,ERR_CAST};
statement S;
@@

x = f(...);
(
if (\(x == NULL\|IS_ERR(x)\)) S
|
*if (\(y == NULL\|IS_ERR(y)\))
 { ... when != x
   return ...; }
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/net/wireless/mwifiex/scan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index b28241c..d3111c9 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1480,7 +1480,7 @@ mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
 		return -ENOMEM;
 	}
 	beacon_ie = kzalloc(ie_len, GFP_KERNEL);
-	if (!bss_desc) {
+	if (!beacon_ie) {
 		dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
 		return -ENOMEM;
 	}

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