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

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Date:	Wed,  5 Dec 2012 10:38:57 -0700
From:	Tim Gardner <tim.gardner@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	Tim Gardner <tim.gardner@...onical.com>,
	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Lin Ming <ming.m.lin@...el.com>,
	Bob Moore <robert.moore@...el.com>, 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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