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authorToshi Kani <toshi.kani@hp.com>2013-07-10 10:47:13 -0600
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-07-15 01:26:18 +0200
commitd19f503e22316a84c39bc19445e0e4fdd49b3532 (patch)
tree74f7aef19ca9e50869549e4105709e8c69426935 /drivers/acpi
parent8832f7e43fa7f0f19bd54e13766a825dd1ed4d6f (diff)
downloadlinux-d19f503e22316a84c39bc19445e0e4fdd49b3532.tar.bz2
ACPI / memhotplug: Fix a stale pointer in error path
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> Cc: 2.6.32+ <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-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 c711d1144044..999adb5499c7 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -323,6 +323,7 @@ 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;
}