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 879952254071f38158b16386c5a29ae21a547d7b..b2cc1191be695e8d7218c48a7a0eacac46acfa29 100644 (file)
--- 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;