svn commit: r245218 - stable/9/sys/kern

[Konstantin Belousov]

Author: kib
Date: Wed Jan  9 05:49:52 2013
New Revision: 245218
URL: http://svnweb.freebsd.org/changeset/base/245218

Log:
  MFC r245104:
  Protect the p->p_pgrp dereference with the process lock.

Modified:
  stable/9/sys/kern/kern_exit.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/kern_exit.c
==============================================================================
--- stable/9/sys/kern/kern_exit.c	Wed Jan  9 05:44:55 2013	(r245217)
+++ stable/9/sys/kern/kern_exit.c	Wed Jan  9 05:49:52 2013	(r245218)
@@ -1069,7 +1069,9 @@ 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;
 	}