linux-kernel - [ 12/16] hwmon: (applesmc) Check key count before proceeding

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Message-Id: <20131003040446.376616667@linuxfoundation.org>
Date:	Wed,  2 Oct 2013 21:05:36 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, jwboyer@...oraproject.org,
	Guenter Roeck <linux@...ck-us.net>,
	Henrik Rydberg <rydberg@...omail.se>
Subject: [ 12/16] hwmon: (applesmc) Check key count before proceeding

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

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

From: Henrik Rydberg <rydberg@...omail.se>

commit 5f4513864304672e6ea9eac60583eeac32e679f2 upstream.

After reports from Chris and Josh Boyer of a rare crash in applesmc,
Guenter pointed at the initialization problem fixed below. The patch
has not been verified to fix the crash, but should be applied
regardless.

Reported-by: <jwboyer@...oraproject.org>
Suggested-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/applesmc.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -489,16 +489,25 @@ static int applesmc_init_smcreg_try(void
 {
 	struct applesmc_registers *s = &smcreg;
 	bool left_light_sensor, right_light_sensor;
+	unsigned int count;
 	u8 tmp[1];
 	int ret;
 
 	if (s->init_complete)
 		return 0;
 
-	ret = read_register_count(&s->key_count);
+	ret = read_register_count(&count);
 	if (ret)
 		return ret;
 
+	if (s->cache && s->key_count != count) {
+		pr_warn("key count changed from %d to %d\n",
+			s->key_count, count);
+		kfree(s->cache);
+		s->cache = NULL;
+	}
+	s->key_count = count;
+
 	if (!s->cache)
 		s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
 	if (!s->cache)


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