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From: Jung-uk Kim <jkim@FreeBSD.org>
Date: Thu, 15 Jun 2017 02:39:33 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r319963 - stable/11/sys/vm
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Author: jkim
Date: Thu Jun 15 02:39:33 2017
New Revision: 319963
URL: https://svnweb.freebsd.org/changeset/base/319963

Log:
  Null pointer must be checked before use.  This fixes a regression introduced
  in r318716.
  
  Note it is a direct commit to stable/11 because head removed support for
  idle page zeroing in r305362.
  
  PR:		219994
  Reviewed by:	markj
  Approved by:	re (gjb)

Modified:
  stable/11/sys/vm/vm_page.c

Modified: stable/11/sys/vm/vm_page.c
==============================================================================
--- stable/11/sys/vm/vm_page.c	Thu Jun 15 00:59:02 2017	(r319962)
+++ stable/11/sys/vm/vm_page.c	Thu Jun 15 02:39:33 2017	(r319963)
@@ -1759,18 +1759,18 @@ retry:
 		pagedaemon_wakeup();
 		return (NULL);
 	}
-	if (m_ret != NULL)
+	if (m_ret != NULL) {
 		vm_phys_freecnt_adj(m_ret, -npages);
-	else {
+		for (m = m_ret; m < &m_ret[npages]; m++)
+			if ((m->flags & PG_ZERO) != 0)
+				vm_page_zero_count--;
+	} else {
 #if VM_NRESERVLEVEL > 0
 		if (vm_reserv_reclaim_contig(npages, low, high, alignment,
 		    boundary))
 			goto retry;
 #endif
 	}
-	for (m = m_ret; m < &m_ret[npages]; m++)
-		if ((m->flags & PG_ZERO) != 0)
-			vm_page_zero_count--;
 	mtx_unlock(&vm_page_queue_free_mtx);
 	if (m_ret == NULL)
 		return (NULL);