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ACPICA: Fix error code path in acpi_ds_call_control_method() 

[ Upstream commit 404ec60438 ]

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/ # [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>
This commit is contained in:
Rafael J. Wysocki 2022-11-07 18:42:36 +01:00 committed by Greg Kroah-Hartman
parent f8d4d0bac6
commit 38e251d356
1 changed files with 8 additions and 2 deletions
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10
drivers/acpi/acpica/dsmethod.c
View File

@ -547,7 +547,7 @@ 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];
@ -559,7 +559,7 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
ACPI_FREE(info);
if (ACPI_FAILURE(status)) {
goto cleanup;
goto pop_walk_state;
}
/*
@ -591,6 +591,12 @@ 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 */