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Rafael J. Wysocki authored
When associating a "physical" device with an ACPI device object acpi_bind_one() only uses get_device() to increment the reference counter of the former, but there is no reason not to do that with the latter too. Among other things, that may help to avoid use-after-free when an ACPI device object is freed without calling acpi_unbind_one() for all "physical" devices associated with it (that only can happen in buggy code, but then it's better if the kernel doesn't crash as a result of a bug). For this reason, modify acpi_bind_one() to apply get_device() to the ACPI device object too and update acpi_unbind_one() to drop that reference using put_device() as appropriate. Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by:
Lan Tianyu <tianyu.lan@intel.com>
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