[10/85] zram: destroy all devices on error recovery path inzram_init()

[Ben Hutchings]

3.2.49-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jiang Liu <liuj97@xxxxxxxxx>

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@xxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Acked-by: Jerome Marchand <jmarchan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/staging/zram/zram_drv.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -715,7 +715,7 @@ static const struct block_device_operati
 
 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);
@@ -725,7 +725,6 @@ static int create_device(struct zram *zr
 	if (!zram->queue) {
 		pr_err("Error allocating disk queue for device %d\n",
 			device_id);
-		ret = -ENOMEM;
 		goto out;
 	}
 
@@ -735,11 +734,9 @@ static int create_device(struct zram *zr
 	 /* gendisk structure */
 	zram->disk = alloc_disk(1);
 	if (!zram->disk) {
-		blk_cleanup_queue(zram->queue);
 		pr_warning("Error allocating disk structure for device %d\n",
 			device_id);
-		ret = -ENOMEM;
-		goto out;
+		goto out_free_queue;
 	}
 
 	zram->disk->major = zram_major;
@@ -768,11 +765,17 @@ static int create_device(struct zram *zr
 				&zram_disk_attr_group);
 	if (ret < 0) {
 		pr_warning("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;
 }

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