From: "Rafael J. Wysocki" rafael.j.wysocki@intel.com
[ Upstream commit 404ec60438add1afadaffaed34bb5fe4ddcadd40 ]
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@huaw... # [1] 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/acpica/dsmethod.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/acpica/dsmethod.c b/drivers/acpi/acpica/dsmethod.c index cf67caff878a..97971c79c5f5 100644 --- 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 */