From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Date: Thu, 26 May 2022 09:51:03 +0000 (+0300)
Subject: fs/ntfs3: Fix missing i_op in ntfs_read_mft
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c293e8abc09e6e1faa50d967bd8862b1cbd575e5;p=linux.git

fs/ntfs3: Fix missing i_op in ntfs_read_mft

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>
---

diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index 879952254071f..b2cc1191be695 100644
--- 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;