ACPI: processor: Fix memory leaks in error paths of processor_add()

If acpi_processor_get_info() returned an error, pr and the associated
pr->throttling.shared_cpu_map were leaked.

The unwind code was in the wrong order wrt to setup, relying on
some unwind actions having no affect (clearing variables that were
never set etc).  That makes it harder to reason about so reorder
and add appropriate labels to only undo what was actually set up
in the first place.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240529133446.28446-6-Jonathan.Cameron@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 5f062806ca40288aee601758be555fd7ead82e48..16e36e55a560dd03235913f36b2264f6bdd2b571 100644 (file)
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -393,7 +393,7 @@ static int acpi_processor_add(struct acpi_device *device,
 
        result = acpi_processor_get_info(device);
        if (result) /* Processor is not physically present or unavailable */
-               return result;
+               goto err_clear_driver_data;
 
        BUG_ON(pr->id >= nr_cpu_ids);
 
@@ -408,7 +408,7 @@ static int acpi_processor_add(struct acpi_device *device,
                        "BIOS reported wrong ACPI id %d for the processor\n",
                        pr->id);
                /* Give up, but do not abort the namespace scan. */
-               goto err;
+               goto err_clear_driver_data;
        }
        /*
         * processor_device_array is not cleared on errors to allow buggy BIOS
@@ -420,12 +420,12 @@ static int acpi_processor_add(struct acpi_device *device,
        dev = get_cpu_device(pr->id);
        if (!dev) {
                result = -ENODEV;
-               goto err;
+               goto err_clear_per_cpu;
        }
 
        result = acpi_bind_one(dev, device);
        if (result)
-               goto err;
+               goto err_clear_per_cpu;
 
        pr->dev = dev;
 
@@ -436,10 +436,11 @@ static int acpi_processor_add(struct acpi_device *device,
        dev_err(dev, "Processor driver could not be attached\n");
        acpi_unbind_one(dev);
 
- err:
-       free_cpumask_var(pr->throttling.shared_cpu_map);
-       device->driver_data = NULL;
+ err_clear_per_cpu:
        per_cpu(processors, pr->id) = NULL;
+ err_clear_driver_data:
+       device->driver_data = NULL;
+       free_cpumask_var(pr->throttling.shared_cpu_map);
  err_free_pr:
        kfree(pr);
        return result;