linux-kernel - [PATCH 1/7 v2] fix memory leak when memory device is unbound from the module acpi

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Message-ID: <4FFD2F76.9000508@cn.fujitsu.com>
Date:	Wed, 11 Jul 2012 15:47:02 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 1/7 v2] fix memory leak when memory device is unbound from
 the module acpi_memhotplug

We allocate memory to store acpi_memory_info, so we should free it before
freeing mem_device.

Signed-off-by: Wen Congyang <wency@...fujitsu.com>
---
 drivers/acpi/acpi_memhotplug.c |   31 +++++++++++++++++++++----------
 1 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index d985713..fe699ec 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -125,12 +125,20 @@ acpi_memory_get_resource(struct acpi_resource *resource, void *context)
 	return AE_OK;
 }
 
+static void
+acpi_memory_free_device_resources(struct acpi_memory_device *mem_device)
+{
+	struct acpi_memory_info *info, *n;
+
+	list_for_each_entry_safe(info, n, &mem_device->res_list, list)
+		kfree(info);
+	INIT_LIST_HEAD(&mem_device->res_list);
+}
+
 static int
 acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
 {
 	acpi_status status;
-	struct acpi_memory_info *info, *n;
-
 
 	if (!list_empty(&mem_device->res_list))
 		return 0;
@@ -138,9 +146,7 @@ acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
 	status = acpi_walk_resources(mem_device->device->handle, METHOD_NAME__CRS,
 				     acpi_memory_get_resource, mem_device);
 	if (ACPI_FAILURE(status)) {
-		list_for_each_entry_safe(info, n, &mem_device->res_list, list)
-			kfree(info);
-		INIT_LIST_HEAD(&mem_device->res_list);
+		acpi_memory_free_device_resources(mem_device);
 		return -EINVAL;
 	}
 
@@ -399,6 +405,15 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
 	return;
 }
 
+static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
+{
+	if (!mem_device)
+		return;
+
+	acpi_memory_free_device_resources(mem_device);
+	kfree(mem_device);
+}
+
 static int acpi_memory_device_add(struct acpi_device *device)
 {
 	int result;
@@ -451,14 +466,10 @@ static int acpi_memory_device_add(struct acpi_device *device)
 
 static int acpi_memory_device_remove(struct acpi_device *device, int type)
 {
-	struct acpi_memory_device *mem_device = NULL;
-
-
 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;
 
-	mem_device = acpi_driver_data(device);
-	kfree(mem_device);
+	acpi_memory_device_free(acpi_driver_data(device));
 
 	return 0;
 }
-- 
1.7.1

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