Patchwork [021/106] ACPI / memhotplug: Fix a stale pointer in error path

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Submitter Luis Henriques
Date July 30, 2013, 9:30 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/263308/
State New
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Luis Henriques - July 30, 2013, 9:30 a.m. -stable review patch.  If anyone has any objections, please let me know.


From: Toshi Kani <>

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 <>
Reviewed-by: Yasuaki Ishimatsu <>
Signed-off-by: Rafael J. Wysocki <>
Signed-off-by: Luis Henriques <>
 drivers/acpi/acpi_memhotplug.c | 1 +
 1 file changed, 1 insertion(+)


diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index d985713..f81597f 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -421,6 +421,7 @@  static int acpi_memory_device_add(struct acpi_device *device)
 	/* Get the range from the _CRS */
 	result = acpi_memory_get_device_resources(mem_device);
 	if (result) {
+		device->driver_data = NULL;
 		return result;