[src/trunk]: src/sys/msdosfs Add some minimal validation of the fsinfo.

[augustss <augustss%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4d0863a0bb02
branches:  trunk
changeset: 519631:4d0863a0bb02
user:      augustss <augustss%NetBSD.org@localhost>
date:      Sat Dec 22 19:45:54 2001 +0000

description:
Add some minimal validation of the fsinfo.

diffstat:

 sys/msdosfs/msdosfs_vfsops.c |  11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diffs (33 lines):

diff -r d28414d66f0a -r 4d0863a0bb02 sys/msdosfs/msdosfs_vfsops.c
--- a/sys/msdosfs/msdosfs_vfsops.c      Sat Dec 22 19:39:42 2001 +0000
+++ b/sys/msdosfs/msdosfs_vfsops.c      Sat Dec 22 19:45:54 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: msdosfs_vfsops.c,v 1.77 2001/11/10 13:26:46 lukem Exp $        */
+/*     $NetBSD: msdosfs_vfsops.c,v 1.78 2001/12/22 19:45:54 augustss Exp $     */
 
 /*-
  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
@@ -48,7 +48,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.77 2001/11/10 13:26:46 lukem Exp $");
+__KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.78 2001/12/22 19:45:54 augustss Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_quota.h"
@@ -659,8 +659,13 @@
        }
 
        /*
-        * Check and validate (or perhaps invalidate?) the fsinfo structure?            XXX
+        * Check and validate (or perhaps invalidate?) the fsinfo structure?
+        * XXX
         */
+       if (pmp->pm_fsinfo) {
+               if (pmp->pm_nxtfree == (u_long)-1)
+                       pmp->pm_fsinfo = 0;
+       }
 
        /*
         * Allocate memory for the bitmap of allocated clusters, and then