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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 6 Jan 2013 15:10:11 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r245104 - head/sys/kern
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Author: kib
Date: Sun Jan  6 15:10:10 2013
New Revision: 245104
URL: http://svnweb.freebsd.org/changeset/base/245104

Log:
  Protect the p->p_pgrp dereference with the process lock.
  
  MFC after:	3 days

Modified:
  head/sys/kern/kern_exit.c

Modified: head/sys/kern/kern_exit.c
==============================================================================
--- head/sys/kern/kern_exit.c	Sun Jan  6 15:07:19 2013	(r245103)
+++ head/sys/kern/kern_exit.c	Sun Jan  6 15:10:10 2013	(r245104)
@@ -1074,7 +1074,9 @@ kern_wait6(struct thread *td, idtype_t i
 	q = td->td_proc;
 
 	if ((pid_t)id == WAIT_MYPGRP && (idtype == P_PID || idtype == P_PGID)) {
+		PROC_LOCK(q);
 		id = (id_t)q->p_pgid;
+		PROC_UNLOCK(q);
 		idtype = P_PGID;
 	}