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From: Kirk McKusick <mckusick@FreeBSD.org>
Date: Thu, 3 Dec 2015 02:04:22 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r291671 - head/sys/kern
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Author: mckusick
Date: Thu Dec  3 02:04:22 2015
New Revision: 291671
URL: https://svnweb.freebsd.org/changeset/base/291671

Log:
  We need to zero out the union of pointers in a freed vnode structure.
  
  PR:        204949
  Fix from:  Mateusz Guzik
  Tested by: Jason Unovitch

Modified:
  head/sys/kern/vfs_subr.c

Modified: head/sys/kern/vfs_subr.c
==============================================================================
--- head/sys/kern/vfs_subr.c	Thu Dec  3 02:00:36 2015	(r291670)
+++ head/sys/kern/vfs_subr.c	Thu Dec  3 02:04:22 2015	(r291671)
@@ -2782,6 +2782,7 @@ _vdrop(struct vnode *vp, bool locked)
 	/* XXX Elsewhere we detect an already freed vnode via NULL v_op. */
 	vp->v_op = NULL;
 #endif
+	bzero(&vp->v_un, sizeof(vp->v_un));
 	vp->v_iflag = 0;
 	vp->v_vflag = 0;
 	bo->bo_flag = 0;