linux-kernel - [PATCH] platform driver: fix use-after-free in platform_device

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Date:	Mon, 25 Jul 2016 16:13:32 +0200
From:	"Jerome Marchand" <jmarchan@...hat.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] platform driver: fix use-after-free in platform_device_del()

In platform_device_del(), the device is still used after a call to
device_del(). At this point there is no guarantee that the device is
still there and there could be a use-after-free access. Move the
call to device_remove_properties() before device_del() to fix that.

Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
---
 drivers/base/platform.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 6482d47..f57fff3 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -434,6 +434,7 @@ void platform_device_del(struct platform_device *pdev)
 	int i;
 
 	if (pdev) {
+		device_remove_properties(&pdev->dev);
 		device_del(&pdev->dev);
 
 		if (pdev->id_auto) {
@@ -446,8 +447,6 @@ void platform_device_del(struct platform_device *pdev)
 			if (r->parent)
 				release_resource(r);
 		}
-
-		device_remove_properties(&pdev->dev);
 	}
 }
 EXPORT_SYMBOL_GPL(platform_device_del);
-- 
2.5.5