fs/ntfs3: Fix WARNING in ntfs_extend_initialized_size

[ Upstream commit ff355926445897cc9fdea3b00611e514232c213c ]

Syzbot reported a WARNING in ntfs_extend_initialized_size.
The data type of in->i_valid and to is u64 in ntfs_file_mmap().
If their values are greater than LLONG_MAX, overflow will occur because
the data types of the parameters valid and new_valid corresponding to
the function ntfs_extend_initialized_size() are loff_t.

Before calling ntfs_extend_initialized_size() in the ntfs_file_mmap(),
the "ni->i_valid < to" has been determined, so the same WARN_ON determination
is not required in ntfs_extend_initialized_size().
Just execute the ntfs_extend_initialized_size() in ntfs_extend() to make
a WARN_ON check.

Reported-and-tested-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=e37dd1dfc814b10caa55
Signed-off-by: Edward Adam Davis <[email protected]>
Signed-off-by: Konstantin Komarov <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit 423e146ed630f5c0586069a2aa60b86d90be94cc)
Signed-off-by: Vijayendra Suman <[email protected]>

Author: ea1davis

fs/ntfs3/file.c

@@ -435,6 +435,7 @@ static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
 	}
 
 	if (extend_init && !is_compressed(ni)) {
+		WARN_ON(ni->i_valid >= pos);
 		err = ntfs_extend_initialized_size(file, ni, ni->i_valid, pos);
 		if (err)
 			goto out;