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From: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Wed, 4 Oct 2017 11:58:53 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r324268 - stable/11/sys/kern
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X-SVN-Commit-Author: trasz
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Author: trasz
Date: Wed Oct  4 11:58:52 2017
New Revision: 324268
URL: https://svnweb.freebsd.org/changeset/base/324268

Log:
  MFC r323183:
  
  Make root_mount_rel(9) ignore NULL arguments, like it used to before r313351.
  It would be better to fix API consumers to not pass NULL there - most of them,
  such as gmirror, already contain the neccessary checks - but this is easier
  and much less error-prone.
  
  One known user-visible result is that it fixes panic on a failed "graid label".

Modified:
  stable/11/sys/kern/vfs_mountroot.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/kern/vfs_mountroot.c
==============================================================================
--- stable/11/sys/kern/vfs_mountroot.c	Wed Oct  4 11:55:34 2017	(r324267)
+++ stable/11/sys/kern/vfs_mountroot.c	Wed Oct  4 11:58:52 2017	(r324268)
@@ -183,7 +183,8 @@ void
 root_mount_rel(struct root_hold_token *h)
 {
 
-	KASSERT(h != NULL, ("%s: NULL token", __func__));
+	if (h == NULL)
+		return;
 
 	mtx_lock(&root_holds_mtx);
 	LIST_REMOVE(h, list);