From 90bf3e28ef51aa3f480d2f2151813be669ba69ce Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.king@canonical.com>
Date: Wed, 2 Jun 2021 11:06:59 +0100
Subject: [PATCH] null_blk: Fix null pointer dereference on nullb->disk on
blk_cleanup_disk call
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@canonical.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210602100659.11058-1-colin.king@canonical.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
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 d8e098f1e5b54..83d803cb57c80 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;
--
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