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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 5 Oct 2018 18:15:44 +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: r339204 - stable/11/sys/vm
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Author: kib
Date: Fri Oct  5 18:15:44 2018
New Revision: 339204
URL: https://svnweb.freebsd.org/changeset/base/339204

Log:
  MFC r338999:
  Correct vm_fault_copy_entry() handling of backing file truncation
  after the file mapping was wired.

Modified:
  stable/11/sys/vm/vm_fault.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/vm/vm_fault.c
==============================================================================
--- stable/11/sys/vm/vm_fault.c	Fri Oct  5 18:14:18 2018	(r339203)
+++ stable/11/sys/vm/vm_fault.c	Fri Oct  5 18:15:44 2018	(r339204)
@@ -1711,6 +1711,13 @@ again:
 			dst_m = src_m;
 			if (vm_page_sleep_if_busy(dst_m, "fltupg"))
 				goto again;
+			if (dst_m->pindex >= dst_object->size)
+				/*
+				 * We are upgrading.  Index can occur
+				 * out of bounds if the object type is
+				 * vnode and the file was truncated.
+				 */
+				break;
 			vm_page_xbusy(dst_m);
 			KASSERT(dst_m->valid == VM_PAGE_BITS_ALL,
 			    ("invalid dst page %p", dst_m));