linux-kernel - [PATCH v2 1/2] ubi: block: fix null-pointer-dereference in ubiblock

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Message-Id: <20240521191347.413578-2-linan666@huaweicloud.com>
Date: Wed, 22 May 2024 03:13:46 +0800
From: linan666@...weicloud.com
To: richard@....at,
	miquel.raynal@...tlin.com,
	vigneshr@...com,
	axboe@...nel.dk,
	chaitanya.kulkarni@....com
Cc: linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	chengzhihao1@...wei.com,
	linan666@...weicloud.com,
	yukuai3@...wei.com,
	yi.zhang@...wei.com,
	houtao1@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH v2 1/2] ubi: block: fix null-pointer-dereference in ubiblock_create()

From: Li Nan <linan122@...wei.com>

Similar to commit adbf4c4954e3 ("ubi: block: fix memleak in
ubiblock_create()"), 'dev->gd' is not assigned but dereferenced if
blk_mq_alloc_tag_set() fails, and leading to a null-pointer-dereference.
Thus pass the variable 'gd' to dev_err() directly.

Fixes: 77567b25ab9f ("ubi: use blk_mq_alloc_disk and blk_cleanup_disk")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Li Nan <linan122@...wei.com>
---
 drivers/mtd/ubi/block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index f82e3423acb9..3b61196d387b 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -390,7 +390,7 @@ int ubiblock_create(struct ubi_volume_info *vi)
 
 	ret = blk_mq_alloc_tag_set(&dev->tag_set);
 	if (ret) {
-		dev_err(disk_to_dev(dev->gd), "blk_mq_alloc_tag_set failed");
+		dev_err(disk_to_dev(gd), "blk_mq_alloc_tag_set failed");
 		goto out_free_dev;
 	}
 
-- 
2.39.2