linux-kernel - [PATCH] spi: Fix double-free on spi_unregister

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Message-Id: <20071108.233505.25913499.anemo@mba.ocn.ne.jp>
Date:	Thu, 08 Nov 2007 23:35:05 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	David Brownell <david-b@...bell.net>, Tony Jones <tonyj@...e.de>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH] spi: Fix double-free on spi_unregister_master

After 49dce689ad4ef0fd1f970ef762168e4bd46f69a3, device_for_each_child
iteration hits the master device itself.  Do not call
spi_unregister_device() for the master device.

Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
---
 drivers/spi/spi.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 89769ce..b31f443 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -457,10 +457,11 @@ done:
 EXPORT_SYMBOL_GPL(spi_register_master);
 
 
-static int __unregister(struct device *dev, void *unused)
+static int __unregister(struct device *dev, void *master_dev)
 {
 	/* note: before about 2.6.14-rc1 this would corrupt memory: */
-	spi_unregister_device(to_spi_device(dev));
+	if (dev != master_dev)
+		spi_unregister_device(to_spi_device(dev));
 	return 0;
 }
 
@@ -478,7 +479,8 @@ void spi_unregister_master(struct spi_master *master)
 {
 	int dummy;
 
-	dummy = device_for_each_child(master->dev.parent, NULL, __unregister);
+	dummy = device_for_each_child(master->dev.parent, &master->dev,
+					__unregister);
 	device_unregister(&master->dev);
 }
 EXPORT_SYMBOL_GPL(spi_unregister_master);
-
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