linux-kernel - [PATCH 09/24] macintosh: fix dangling pointers

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Message-Id: <1269094385-16114-10-git-send-email-w.sang@pengutronix.de>
Date:	Sat, 20 Mar 2010 15:12:50 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	kernel-janitors@...r.kernel.org
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Wolfram Sang <w.sang@...gutronix.de>,
	Colin Leroy <colin@...ino.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org
Subject: [PATCH 09/24] macintosh: fix dangling pointers

Fix I2C-drivers which missed setting clientdata to NULL before freeing the
structure it points to. Also fix drivers which do this _after_ the structure
was freed already.

Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
Cc: Colin Leroy <colin@...ino.net>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---

Found using coccinelle, then reviewed. Full patchset is available via
kernel-janitors, linux-i2c, and LKML.
---
 drivers/macintosh/therm_adt746x.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index c42eeb4..16d82f1 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -182,6 +182,7 @@ remove_thermostat(struct i2c_client *client)
 
 	thermostat = NULL;
 
+	i2c_set_clientdata(client, NULL);
 	kfree(th);
 
 	return 0;
@@ -399,6 +400,7 @@ static int probe_thermostat(struct i2c_client *client,
 	rc = read_reg(th, CONFIG_REG);
 	if (rc < 0) {
 		dev_err(&client->dev, "Thermostat failed to read config!\n");
+		i2c_set_clientdata(client, NULL);
 		kfree(th);
 		return -ENODEV;
 	}
-- 
1.7.0

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