[PATCH] ACPI: Fix potential NULL pointer dereference in acpi_processor_add()

[Hanjun Guo]

In acpi_processor_add(), get_cpu_device() will return NULL sometimes,
although the chances are small, I think it should be fixed.

Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
 drivers/acpi/processor_driver.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index bec717f..dd64f23 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -579,6 +579,10 @@ static int __cpuinit acpi_processor_add(struct acpi_device
*device)
        per_cpu(processors, pr->id) = pr;

        dev = get_cpu_device(pr->id);
+       if (!dev) {
+               result = -ENODEV;
+               goto err_clear_processor;
+       }
        if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) {
                result = -EFAULT;
                goto err_clear_processor;
-- 
1.7.1
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