From 90a660e1998ee05094bf75302aa1793533c0629a Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Tue, 21 Sep 2004 08:33:05 +0000
Subject: [PATCH] If a vnode has no v_rdev we cannot hope to answer FIODTYPE
 ioctl.

---
 sys/kern/vfs_vnops.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index d8204b6e985..7cc09ccb04f 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -806,6 +806,8 @@ vn_ioctl(fp, com, data, active_cred, td)
 	case VCHR:
 	case VBLK:
 		if (com == FIODTYPE) {
+			if (vp->v_rdev == NULL)
+				return (EOPNOTSUPP);
 			if (vp->v_type != VCHR && vp->v_type != VBLK)
 				return (ENOTTY);
 			*(int *)data = devsw(vp->v_rdev)->d_flags & D_TYPEMASK;