ext4: fix error code in ext4_commit_super

stable inclusion
from stable-5.10.36
commit 12905cf9e5c418fe8ad45e56d8d79848c6b11558
bugzilla: 51867
CVE: NA

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

commit f88f1466 upstream.

We should set the error code when ext4_commit_super check argument failed.
Found in code review.
Fixes: c4be0c1d ("filesystem freeze: add error handling of write_super_lockfs/unlockfs").

Cc: stable@kernel.org
Signed-off-by: NFengnan Chang <changfengnan@vivo.com>
Reviewed-by: NAndreas Dilger <adilger@dilger.ca>
Link: https://lore.kernel.org/r/20210402101631.561-1-changfengnan@vivo.comSigned-off-by: NTheodore Ts'o <tytso@mit.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>

Conflicts:
	fs/ext4/super.c
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/ext4/super.c

@@ -5553,8 +5553,10 @@ static int ext4_commit_super(struct super_block *sb)
 	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
 	int error = 0;
 
-	if (!sbh || block_device_ejected(sb))
-		return error;
+	if (!sbh)
+		return -EINVAL;
+	if (block_device_ejected(sb))
+		return -ENODEV;
 
 	ext4_update_super(sb);