Explicitly check show_devname method return code and bail out in case
of an error. This fixes regression introduced by commit
9d4d65748a5c.
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
if (sb->s_op->show_devname) {
seq_puts(m, "device ");
err = sb->s_op->show_devname(m, mnt_path.dentry);
+ if (err)
+ goto out;
} else {
if (r->mnt_devname) {
seq_puts(m, "device ");