From 65baf8f06be716fc398b13c46e97cc7eab2bb5f0 Mon Sep 17 00:00:00 2001
From: Bruce Evans <bde@FreeBSD.org>
Date: Sun, 25 Oct 1998 19:26:18 +0000
Subject: Don't follow null bdevsw pointers.  The `major(dev) < nblkdev' test
 rotted when bdevsw[] became sparse.  We still depend on magic to avoid having
 to check that (v_rdev) device numbers in vnodes are not NODEV.

---
 sys/gnu/fs/ext2fs/ext2_vfsops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'sys/gnu/fs')

diff --git a/sys/gnu/fs/ext2fs/ext2_vfsops.c b/sys/gnu/fs/ext2fs/ext2_vfsops.c
index 11045341bdf96..ef80d74e154b6 100644
--- a/sys/gnu/fs/ext2fs/ext2_vfsops.c
+++ b/sys/gnu/fs/ext2fs/ext2_vfsops.c
@@ -276,7 +276,8 @@ ext2_mount(mp, path, data, ndp, p)
 		vrele(devvp);
 		return (ENOTBLK);
 	}
-	if (major(devvp->v_rdev) >= nblkdev) {
+	if (major(devvp->v_rdev) >= nblkdev ||
+	    bdevsw[major(devvp->v_rdev)] == NULL) {
 		vrele(devvp);
 		return (ENXIO);
 	}
-- 
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