diff options
| author | Toshi Kani <toshi.kani@hp.com> | 2013-07-10 10:47:13 -0600 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-07-15 01:26:18 +0200 |
| commit | d19f503e22316a84c39bc19445e0e4fdd49b3532 (patch) | |
| tree | 74f7aef19ca9e50869549e4105709e8c69426935 /drivers | |
| parent | 8832f7e43fa7f0f19bd54e13766a825dd1ed4d6f (diff) | |
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')
| -rw-r--r-- | drivers/acpi/acpi_memhotplug.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index c711d114404..999adb5499c 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; } |