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Date: Sat, 17 Dec 2022 10:28:55 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Chen Zhongjin <chenzhongjin@...wei.com>, Sasha Levin <sashal@...nel.org>, robert.moore@...el.com, linux-acpi@...r.kernel.org, devel@...ica.org Subject: [PATCH AUTOSEL 5.15 05/10] ACPICA: Fix error code path in acpi_ds_call_control_method() From: "Rafael J. Wysocki" <rafael.j.wysocki@...el.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@huawei.com/ # [1] Reported-by: Chen Zhongjin <chenzhongjin@...wei.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Reviewed-by: Chen Zhongjin <chenzhongjin@...wei.com> Signed-off-by: Sasha Levin <sashal@...nel.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 8e011e59b9b4..ee1832ba39a2 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 */ -- 2.35.1
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