svn commit: r353957 - head/sys/vm

[Mark Johnston]

Author: markj
Date: Wed Oct 23 18:00:22 2019
New Revision: 353957
URL: https://svnweb.freebsd.org/changeset/base/353957

Log:
  Check for bogus_page in vnode_pager_generic_getpages_done().
  
  We now assert that a page is busy when updating its validity-tracking
  state, but bogus_page is not busied during a getpages operation.
  
  Reported by:	syzkaller
  Reviewed by:	alc, kib
  Discussed with:	jeff
  MFC after:	1 week
  Sponsored by:	The FreeBSD Foundation
  Differential Revision:	https://reviews.freebsd.org/D22124

Modified:
  head/sys/vm/vnode_pager.c

Modified: head/sys/vm/vnode_pager.c
==============================================================================
--- head/sys/vm/vnode_pager.c	Wed Oct 23 17:58:19 2019	(r353956)
+++ head/sys/vm/vnode_pager.c	Wed Oct 23 18:00:22 2019	(r353957)
@@ -1149,6 +1149,8 @@ vnode_pager_generic_getpages_done(struct buf *bp)
 
 		nextoff = tfoff + PAGE_SIZE;
 		mt = bp->b_pages[i];
+		if (mt == bogus_page)
+			continue;
 
 		if (nextoff <= object->un_pager.vnp.vnp_size) {
 			/*