linux-kernel - [209/264] hwmon: (w83627ehf) Fix broken driver init

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Date:	Wed, 09 Nov 2011 13:34:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [209/264] hwmon: (w83627ehf) Fix broken driver init

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <guenter.roeck@...csson.com>

commit bfa02b0da66965caf46e441270af87edda4fea14 upstream.

Commit 2265cef2 (hwmon: (w83627ehf) Properly report PECI and AMD-SI
sensor types) results in kernel panic if data->temp_label was not
initialized.
The problem was found with chip W83627DHG-P.

Add check if data->temp->label was set before use.

Based on incomplete patch by Alexander Beregalov.

Reported-by: Alexander Beregalov <a.beregalov@...il.com>
Tested-by: Alexander Beregalov <a.beregalov@...il.com>
Signed-off-by: Guenter Roeck <guenter.roeck@...csson.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hwmon/w83627ehf.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -1756,12 +1756,15 @@ static inline void __devinit w83627ehf_i
 		diode = 0x70;
 	}
 	for (i = 0; i < 3; i++) {
-		const char *label = data->temp_label[data->temp_src[i]];
+		const char *label = NULL;
+
+		if (data->temp_label)
+			label = data->temp_label[data->temp_src[i]];
 
 		/* Digital source overrides analog type */
-		if (strncmp(label, "PECI", 4) == 0)
+		if (label && strncmp(label, "PECI", 4) == 0)
 			data->temp_type[i] = 6;
-		else if (strncmp(label, "AMD", 3) == 0)
+		else if (label && strncmp(label, "AMD", 3) == 0)
 			data->temp_type[i] = 5;
 		else if ((tmp & (0x02 << i)))
 			data->temp_type[i] = (diode & (0x10 << i)) ? 1 : 3;


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