linux-kernel - [PATCH 2/11] drivers/watchdog: Eliminate a NULL pointer dereference

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Date:	Thu, 27 May 2010 14:32:24 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 2/11] drivers/watchdog: Eliminate a NULL pointer dereference

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

At the point of the call to dev_err, wm8350 is NULL.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@

if ((E == NULL && ...) || ...)
{
  ... when != if (...) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

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

---
 drivers/watchdog/wm8350_wdt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/wm8350_wdt.c b/drivers/watchdog/wm8350_wdt.c
index 89dd7b0..b68d928 100644
--- a/drivers/watchdog/wm8350_wdt.c
+++ b/drivers/watchdog/wm8350_wdt.c
@@ -284,7 +284,7 @@ static int __devinit wm8350_wdt_probe(struct platform_device *pdev)
 	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
 
 	if (!wm8350) {
-		dev_err(wm8350->dev, "No driver data supplied\n");
+		pr_err("No driver data supplied\n");
 		return -ENODEV;
 	}
 
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