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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Wed, 17 Feb 2010 10:21:00 +0000 (UTC)
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Subject: svn commit: r203997 - releng/7.3/sys/kern
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Author: kib
Date: Wed Feb 17 10:21:00 2010
New Revision: 203997
URL: http://svn.freebsd.org/changeset/base/203997

Log:
  MFC r203875:
  Do not leak process lock when current thread is not allowed to see target.
  
  Approved by:	re (bz)

Modified:
  releng/7.3/sys/kern/kern_event.c
Directory Properties:
  releng/7.3/sys/   (props changed)
  releng/7.3/sys/cddl/contrib/opensolaris/   (props changed)
  releng/7.3/sys/contrib/dev/acpica/   (props changed)
  releng/7.3/sys/contrib/pf/   (props changed)

Modified: releng/7.3/sys/kern/kern_event.c
==============================================================================
--- releng/7.3/sys/kern/kern_event.c	Wed Feb 17 10:15:17 2010	(r203996)
+++ releng/7.3/sys/kern/kern_event.c	Wed Feb 17 10:21:00 2010	(r203997)
@@ -323,8 +323,10 @@ filt_procattach(struct knote *kn)
 
 	if (p == NULL)
 		return (ESRCH);
-	if ((error = p_cansee(curthread, p)))
+	if ((error = p_cansee(curthread, p))) {
+		PROC_UNLOCK(p);
 		return (error);
+	}
 
 	kn->kn_ptr.p_proc = p;
 	kn->kn_flags |= EV_CLEAR;		/* automatically set */