ACPICA: Fix error code path in acpi_ds_call_control_method()

A use-after-free in acpi_ps_parse_aml() after a failing invocaion of
acpi_ds_call_control_method() is reported by KASAN [1] and code
inspection reveals that next_walk_state pushed to the thread by
acpi_ds_create_walk_state() is freed on errors, but it is not popped
from the thread beforehand.  Thus acpi_ds_get_current_walk_state()
called by acpi_ps_parse_aml() subsequently returns it as the new
walk state which is incorrect.

To address this, make acpi_ds_call_control_method() call
acpi_ds_pop_walk_state() to pop next_walk_state from the thread before
returning an error.

Link: https://lore.kernel.org/linux-acpi/20221019073443.248215-1-chenzhongjin@huawei.com/
Reported-by: Chen Zhongjin <chenzhongjin@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Chen Zhongjin <chenzhongjin@huawei.com>

diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c
index ae2e768830bfc779fae6b928d72d3e6418c980d7..9332bc688713c4dee6f5c00afaaa7071788c5870 100644 (file)
--- a/drivers/acpi/acpica/dsmethod.c
+++ b/drivers/acpi/acpica/dsmethod.c
@@ -517,7 +517,7 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
        info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
        if (!info) {
                status = AE_NO_MEMORY;
-               goto cleanup;
+               goto pop_walk_state;
        }
 
        info->parameters = &this_walk_state->operands[0];
@@ -529,7 +529,7 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 
        ACPI_FREE(info);
        if (ACPI_FAILURE(status)) {
-               goto cleanup;
+               goto pop_walk_state;
        }
 
        next_walk_state->method_nesting_depth =
@@ -575,6 +575,12 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 
        return_ACPI_STATUS(status);
 
+pop_walk_state:
+
+       /* On error, pop the walk state to be deleted from thread */
+
+       acpi_ds_pop_walk_state(thread);
+
 cleanup:
 
        /* On error, we must terminate the method properly */