fuse: add inode/permission checks to fileattr_get/fileattr_set

It looks like these checks were accidentally lost during the conversion to
fileattr API.

Fixes: 72227eac ("fuse: convert to fileattr")
Cc: <stable@vger.kernel.org> # v5.13
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/fuse/ioctl.c

@@ -419,6 +419,12 @@ static struct fuse_file *fuse_priv_ioctl_prepare(struct inode *inode)
 	struct fuse_mount *fm = get_fuse_mount(inode);
 	bool isdir = S_ISDIR(inode->i_mode);
 
+	if (!fuse_allow_current_process(fm->fc))
+		return ERR_PTR(-EACCES);
+
+	if (fuse_is_bad(inode))
+		return ERR_PTR(-EIO);
+
 	if (!S_ISREG(inode->i_mode) && !isdir)
 		return ERR_PTR(-ENOTTY);