linux-kernel - [ 14/23] ACPI / memhotplug: Fix a stale pointer in error path

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Date:	Fri,  2 Aug 2013 18:23:27 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Toshi Kani <toshi.kani@...com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [ 14/23] ACPI / memhotplug: Fix a stale pointer in error path

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

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

From: Toshi Kani <toshi.kani@...com>

commit d19f503e22316a84c39bc19445e0e4fdd49b3532 upstream.

device->driver_data needs to be cleared when releasing its data,
mem_device, in an error path of acpi_memory_device_add().

The function evaluates the _CRS of memory device objects, and fails
when it gets an unexpected resource or cannot allocate memory.  A
kernel crash or data corruption may occur when the kernel accesses
the stale pointer.

Signed-off-by: Toshi Kani <toshi.kani@...com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/acpi_memhotplug.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -421,6 +421,7 @@ static int acpi_memory_device_add(struct
 	/* Get the range from the _CRS */
 	result = acpi_memory_get_device_resources(mem_device);
 	if (result) {
+		device->driver_data = NULL;
 		kfree(mem_device);
 		return result;
 	}

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