[ 3.8.y.z extended stable ] Patch "zram: destroy all devices on error recovery path in" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    zram: destroy all devices on error recovery path in

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From c2b86777169147424b1a801072e89a1f7f84bb00 Mon Sep 17 00:00:00 2001
From: Jiang Liu <liuj97 at gmail.com>
Date: Fri, 7 Jun 2013 00:07:24 +0800
Subject: [PATCH] zram: destroy all devices on error recovery path in
 zram_init()

commit 39a9b8ac9333e4268ecff7da6c9d1ab3823ff243 upstream.

On error recovery path of zram_init(), it leaks the zram device object
causing the failure. So change create_device() to free allocated
resources on error path.

Signed-off-by: Jiang Liu <jiang.liu at huawei.com>
Acked-by: Minchan Kim <minchan at kernel.org>
Acked-by: Jerome Marchand <jmarchan at redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/staging/zram/zram_drv.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 0113897..ff2228e 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -628,7 +628,7 @@ static const struct block_device_operations zram_devops = {

 static int create_device(struct zram *zram, int device_id)
 {
-	int ret = 0;
+	int ret = -ENOMEM;

 	init_rwsem(&zram->lock);
 	init_rwsem(&zram->init_lock);
@@ -638,7 +638,6 @@ static int create_device(struct zram *zram, int device_id)
 	if (!zram->queue) {
 		pr_err("Error allocating disk queue for device %d\n",
 			device_id);
-		ret = -ENOMEM;
 		goto out;
 	}

@@ -648,11 +647,9 @@ static int create_device(struct zram *zram, int device_id)
 	 /* gendisk structure */
 	zram->disk = alloc_disk(1);
 	if (!zram->disk) {
-		blk_cleanup_queue(zram->queue);
 		pr_warn("Error allocating disk structure for device %d\n",
 			device_id);
-		ret = -ENOMEM;
-		goto out;
+		goto out_free_queue;
 	}

 	zram->disk->major = zram_major;
@@ -681,11 +678,17 @@ static int create_device(struct zram *zram, int device_id)
 				&zram_disk_attr_group);
 	if (ret < 0) {
 		pr_warn("Error creating sysfs group");
-		goto out;
+		goto out_free_disk;
 	}

 	zram->init_done = 0;
+	return 0;

+out_free_disk:
+	del_gendisk(zram->disk);
+	put_disk(zram->disk);
+out_free_queue:
+	blk_cleanup_queue(zram->queue);
 out:
 	return ret;
 }
--
1.8.1.2