linux-kernel - [PATCH 2.6.32 32/42] ser_gigaset: fix deallocation of platform device structure

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Message-Id: <20160123141223.377656912@1wt.eu>
Date:	Sat, 23 Jan 2016 15:12:53 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Tilman Schmidt <tilman@...p.cc>,
	Sasha Levin <sasha.levin@...cle.com>,
	Paul Bolle <pebolle@...cali.nl>,
	"David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 32/42] ser_gigaset: fix deallocation of platform device
 structure

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Tilman Schmidt <tilman@...p.cc>

commit 4c5e354a974214dfb44cd23fa0429327693bc3ea upstream.

When shutting down the device, the struct ser_cardstate must not be
kfree()d immediately after the call to platform_device_unregister()
since the embedded struct platform_device is still in use.
Move the kfree() call to the release method instead.

Signed-off-by: Tilman Schmidt <tilman@...p.cc>
Fixes: 2869b23e4b95 ("drivers/isdn/gigaset: new M101 driver (v2)")
Reported-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: Paul Bolle <pebolle@...cali.nl>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit 521e4101aaf46b2f37088453a1e935604cdd7f2a)
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/isdn/gigaset/ser-gigaset.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/isdn/gigaset/ser-gigaset.c b/drivers/isdn/gigaset/ser-gigaset.c
index 3071a52..10b954f 100644
--- a/drivers/isdn/gigaset/ser-gigaset.c
+++ b/drivers/isdn/gigaset/ser-gigaset.c
@@ -381,20 +381,24 @@ static void gigaset_freecshw(struct cardstate *cs)
 	tasklet_kill(&cs->write_tasklet);
 	if (!cs->hw.ser)
 		return;
-	dev_set_drvdata(&cs->hw.ser->dev.dev, NULL);
 	platform_device_unregister(&cs->hw.ser->dev);
-	kfree(cs->hw.ser);
-	cs->hw.ser = NULL;
 }
 
 static void gigaset_device_release(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
+	struct cardstate *cs = dev_get_drvdata(dev);
 
 	/* adapted from platform_device_release() in drivers/base/platform.c */
 	//FIXME is this actually necessary?
 	kfree(dev->platform_data);
 	kfree(pdev->resource);
+
+	if (!cs)
+		return;
+	dev_set_drvdata(dev, NULL);
+	kfree(cs->hw.ser);
+	cs->hw.ser = NULL;
 }
 
 /*
-- 
1.7.12.2.21.g234cd45.dirty