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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, xingaopeng <xingaopeng@huawei.com>,
        Jan Kara <jack@suse.cz>
Subject: [PATCH 4.19 117/139] ext2: initialize opts.s_mount_opt as zero before using it
Date:   Tue,  4 Dec 2018 11:49:58 +0100
Message-Id: <20181204103655.454888182@linuxfoundation.org>
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4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: xingaopeng <xingaopeng@huawei.com>

commit e5f5b717983bccfa033282e9886811635602510e upstream.

We need to initialize opts.s_mount_opt as zero before using it, else we
may get some unexpected mount options.

Fixes: 088519572ca8 ("ext2: Parse mount options into a dedicated structure")
CC: stable@vger.kernel.org
Signed-off-by: xingaopeng <xingaopeng@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/ext2/super.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -895,6 +895,7 @@ static int ext2_fill_super(struct super_
 	if (sb->s_magic != EXT2_SUPER_MAGIC)
 		goto cantfind_ext2;
 
+	opts.s_mount_opt = 0;
 	/* Set defaults before we parse the mount options */
 	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 	if (def_mount_opts & EXT2_DEFM_DEBUG)