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authorToshi Kani <toshi.kani@hp.com>2013-07-10 10:47:13 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-04 16:51:02 +0800
commitbf59e1292e96b3dd4a2c58bbe8ac21e24e71dc42 (patch)
tree2ad6e9f4013c5563ad81b520f83942d880dd2e9f
parent85471df478e22dd96ca4756789abc795683addc9 (diff)
ACPI / memhotplug: Fix a stale pointer in error path
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@hp.com> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/acpi/acpi_memhotplug.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 5e6301e9492..2cf0244d0ee 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -283,6 +283,7 @@ 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;
kfree(mem_device);
return result;
}