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ACPICA: Fix memory leak caused by _CID repair function

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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>
This commit is contained in:
Erik Kaneda 2021-06-04 14:25:57 -07:00 committed by Rafael J. Wysocki
parent 8288f69e47
commit c27bac0314
1 changed files with 7 additions and 0 deletions
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7
drivers/acpi/acpica/nsrepair2.c
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@ -379,6 +379,13 @@ acpi_ns_repair_CID(struct acpi_evaluate_info *info,
(*element_ptr)->common.reference_count = (*element_ptr)->common.reference_count =
original_ref_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++; element_ptr++;