During hot-remove, acpi_bus_hot_remove_device() calls ACPI _LCK
method when device->flags.lockable is set. However, this device
pointer is stale since the target acpi_device object has been
already kfree'd by acpi_bus_trim().
The flags.lockable indicates whether or not this ACPI object
implements _LCK method. Fix the stable pointer access by replacing
it with acpi_get_handle() to check if _LCK is implemented.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
---
drivers/acpi/scan.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 1fcb867..ed87f43 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -97,6 +97,7 @@ void acpi_bus_hot_remove_device(void *context)
struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
struct acpi_device *device;
acpi_handle handle = ej_event->handle;
+ acpi_handle temp;
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status = AE_OK;
@@ -117,13 +118,16 @@ void acpi_bus_hot_remove_device(void *context)
goto err_out;
}
+ /* device has been freed */
+ device = NULL;
+
/* power off device */
status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
printk(KERN_WARNING PREFIX
"Power-off device failed\n");
- if (device->flags.lockable) {
+ if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
--
1.7.11.7
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