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From: Christian Brueffer <brueffer@FreeBSD.org>
Date: Wed, 16 May 2012 19:25:50 +0000 (UTC)
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Subject: svn commit: r235511 - stable/9/sys/security/mac_mls
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Author: brueffer
Date: Wed May 16 19:25:50 2012
New Revision: 235511
URL: http://svn.freebsd.org/changeset/base/235511

Log:
  MFC: r234957
  
  Check vplabel for NULL before dereferencing it.  Fixes a panic
  when running atop with MAC_MLS enabled.

Modified:
  stable/9/sys/security/mac_mls/mac_mls.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/security/mac_mls/mac_mls.c
==============================================================================
--- stable/9/sys/security/mac_mls/mac_mls.c	Wed May 16 17:51:56 2012	(r235510)
+++ stable/9/sys/security/mac_mls/mac_mls.c	Wed May 16 19:25:50 2012	(r235511)
@@ -2028,6 +2028,9 @@ mls_system_check_acct(struct ucred *cred
 	if (!mls_enabled)
 		return (0);
 
+	if (vplabel == NULL)
+		return (0);
+
 	subj = SLOT(cred->cr_label);
 	obj = SLOT(vplabel);