From eb53af1d99d46ca40a06ed10b229d933b2301b49 Mon Sep 17 00:00:00 2001
From: ksn <none@none>
Date: Tue, 10 Jul 2007 15:52:08 -0700
Subject: 6562292 race between drv_getparm and setpgrp leads to panic

---
 usr/src/uts/common/os/ddi.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'usr/src/uts/common/os/ddi.c')

diff --git a/usr/src/uts/common/os/ddi.c b/usr/src/uts/common/os/ddi.c
index 6a0b6ace80..ee817d9c8d 100644
--- a/usr/src/uts/common/os/ddi.c
+++ b/usr/src/uts/common/os/ddi.c
@@ -23,7 +23,7 @@
 
 
 /*
- * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -246,7 +246,7 @@ int
 datamsg(unsigned char db_type)
 {
 	return (db_type == M_DATA || db_type == M_PROTO ||
-		db_type == M_PCPROTO || db_type == M_DELAY);
+	    db_type == M_PCPROTO || db_type == M_DELAY);
 }
 
 /*
@@ -300,7 +300,9 @@ drv_getparm(unsigned int parm, void *valuep)
 		*(proc_t **)valuep = p;
 		break;
 	case PPGRP:
+		mutex_enter(&p->p_lock);
 		*(pid_t *)valuep = p->p_pgrp;
+		mutex_exit(&p->p_lock);
 		break;
 	case LBOLT:
 		*(clock_t *)valuep = lbolt;
-- 
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