From: Erik Kaneda erik.kaneda@intel.com
stable inclusion from linux-4.19.198 commit cc346f84e15189ab3b0453d8aad8471fdb9ad28e
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[ Upstream commit c27bac0314131b11bccd735f7e8415ac6444b667 ]
ACPICA commit 180cb53963aa876c782a6f52cc155d951b26051a
According to the ACPI spec, _CID returns a package containing hardware ID's. Each element of an ASL package contains a reference count from the parent package as well as the element itself.
Name (TEST, Package() { "String object" // this package element has a reference count of 2 })
A memory leak was caused in the _CID repair function because it did not decrement the reference count created by the package. Fix the memory leak by calling acpi_ut_remove_reference on _CID package elements that represent a hardware ID (_HID).
Link: https://github.com/acpica/acpica/commit/180cb539 Tested-by: Shawn Guo shawn.guo@linaro.org Signed-off-by: Erik Kaneda erik.kaneda@intel.com Signed-off-by: Bob Moore robert.moore@intel.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/acpi/acpica/nsrepair2.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/acpi/acpica/nsrepair2.c b/drivers/acpi/acpica/nsrepair2.c index a3bd6280882c3..4c8ce483805d8 100644 --- a/drivers/acpi/acpica/nsrepair2.c +++ b/drivers/acpi/acpica/nsrepair2.c @@ -375,6 +375,13 @@ acpi_ns_repair_CID(struct acpi_evaluate_info *info,
(*element_ptr)->common.reference_count = original_ref_count; + + /* + * The original_element holds a reference from the package object + * that represents _HID. Since a new element was created by _HID, + * remove the reference from the _CID package. + */ + acpi_ut_remove_reference(original_element); }
element_ptr++;