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    Subject[PATCH AUTOSEL 5.10 091/116] ACPICA: Utilities: Avoid deleting the same object twice in a row
    Date
    From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

    [ Upstream commit 1cdfe9e346b4c5509ffe19ccde880fd259d9f7a3 ]

    ACPICA commit c11af67d8f7e3d381068ce7771322f2b5324d687

    If original_count is 0 in acpi_ut_update_ref_count (),
    acpi_ut_delete_internal_obj () is invoked for the target object, which is
    incorrect, because that object has been deleted once already and the
    memory allocated to store it may have been reclaimed and allocated
    for a different purpose by the host OS. Moreover, a confusing debug
    message following the "Reference Count is already zero, cannot
    decrement" warning is printed in that case.

    To fix this issue, make acpi_ut_update_ref_count () return after finding
    that original_count is 0 and printing the above warning.

    Link: https://github.com/acpica/acpica/commit/c11af67d
    Link: https://github.com/acpica/acpica/pull/652
    Reported-by: Mark Asselstine <mark.asselstine@windriver.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@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>
    ---
    drivers/acpi/acpica/utdelete.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c
    index 72d2c0b656339..cb1750e7a6281 100644
    --- a/drivers/acpi/acpica/utdelete.c
    +++ b/drivers/acpi/acpica/utdelete.c
    @@ -422,6 +422,7 @@ acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
    ACPI_WARNING((AE_INFO,
    "Obj %p, Reference Count is already zero, cannot decrement\n",
    object));
    + return;
    }

    ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS,
    --
    2.34.1
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