linux-kernel - RE: [PATCH 3.7-rc8] ACPICA: Fix ACPI mutex object allocation memory leak on error

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Date:	Wed, 5 Dec 2012 17:58:21 +0000
From:	"Moore, Robert" <robert.moore@...el.com>
To:	Tim Gardner <tim.gardner@...onical.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Lin Ming <ming.m.lin@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: RE: [PATCH 3.7-rc8] ACPICA: Fix ACPI mutex object allocation memory
 leak on error

Tim,

Thanks. We will need to backport this change to the ACPICA source code.
Bob


> -----Original Message-----
> From: Tim Gardner [mailto:tim.gardner@...onical.com]
> Sent: Wednesday, December 05, 2012 9:39 AM
> To: linux-kernel@...r.kernel.org
> Cc: Tim Gardner; Len Brown; Rafael J. Wysocki; Lin Ming; Moore, Robert;
> linux-acpi@...r.kernel.org
> Subject: [PATCH 3.7-rc8] ACPICA: Fix ACPI mutex object allocation memory
> leak on error
> 
> An unattached mutex object is not released on error, thereby orphaning
> memory.
> 
> I stumbled on this when looking at the output of smatch:
> 
> drivers/acpi/acpica/dsmethod.c:225 acpi_ds_begin_method_execution() error:
> we previously assumed 'obj_desc->method.mutex' could be null (see line
> 209)
> 
> which led me to have a look at acpi_ds_create_method_mutex().
> 
> Cc: Len Brown <lenb@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...k.pl>
> Cc: Lin Ming <ming.m.lin@...el.com>
> Cc: Bob Moore <robert.moore@...el.com>
> Cc: linux-acpi@...r.kernel.org
> Cc: stable@...r.kernel.org #2.6.29+
> Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
> ---
> 
> This applied to the original version of dsmethod.c which was introduced in
> 95b482a8d31116f3f5c2a5089569393234d06385 (2.6.29).
> 
>  drivers/acpi/acpica/dsmethod.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/acpi/acpica/dsmethod.c
> b/drivers/acpi/acpica/dsmethod.c index aa9a5d4..fe89ea9 100644
> --- a/drivers/acpi/acpica/dsmethod.c
> +++ b/drivers/acpi/acpica/dsmethod.c
> @@ -151,6 +151,7 @@ acpi_ds_create_method_mutex(union acpi_operand_object
> *method_desc)
> 
>  	status = acpi_os_create_mutex(&mutex_desc->mutex.os_mutex);
>  	if (ACPI_FAILURE(status)) {
> +		acpi_ut_delete_object_desc(mutex_desc);
>  		return_ACPI_STATUS(status);
>  	}
> 
> --
> 1.7.9.5

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