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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, Liangbin Lian <jjm2473@gmail.com>,
        Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Subject: [PATCH 5.15 108/244] fs/ntfs3: Fix missing i_op in ntfs_read_mft
Date:   Tue, 23 Aug 2022 10:24:27 +0200
Message-Id: <20220823080102.621190771@linuxfoundation.org>
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From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

commit 37a530bfe56ca9a0d3129598803f2794c7428aae upstream.

There is null pointer dereference because i_op == NULL.
The bug happens because we don't initialize i_op for records in $Extend.
Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")

Reported-by: Liangbin Lian <jjm2473@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/ntfs3/inode.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -430,6 +430,7 @@ end_enum:
 	} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
 		   fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
 		/* Records in $Extend are not a files or general directories. */
+		inode->i_op = &ntfs_file_inode_operations;
 	} else {
 		err = -EINVAL;
 		goto out;