[PATCH][next] null_blk: Fix null pointer dereference on nullb->disk on blk_cleanup_disk call

[Colin King]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

The error handling on a nullb->disk allocation currently jumps to
out_cleanup_disk that calls blk_cleanup_disk with a null pointer causing
a null pointer dereference issue. Fix this by jumping to out_cleanup_tags
instead.

Addresses-Coverity: ("Dereference after null check")
Fixes: 132226b301b5 ("null_blk: convert to blk_alloc_disk/blk_cleanup_disk")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
 drivers/block/null_blk/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index d8e098f1e5b5..83d803cb57c8 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -1856,7 +1856,7 @@ static int null_add_dev(struct nullb_device *dev)
 			goto out_cleanup_tags;
 		nullb->disk = alloc_disk_node(1, nullb->dev->home_node);
 		if (!nullb->disk)
-			goto out_cleanup_disk;
+			goto out_cleanup_tags;
 		nullb->disk->queue = nullb->q;
 	} else if (dev->queue_mode == NULL_Q_BIO) {
 		rv = -ENOMEM;
-- 
2.31.1