svn commit: r333772 - head/sys/arm64/arm64

[Olivier Houchard]

Author: cognet
Date: Thu May 17 22:40:22 2018
New Revision: 333772
URL: https://svnweb.freebsd.org/changeset/base/333772

Log:
  In pmap_get_tables(), check that the L2 is indeed a table before attempting
  to get the l3.

Modified:
  head/sys/arm64/arm64/pmap.c

Modified: head/sys/arm64/arm64/pmap.c
==============================================================================
--- head/sys/arm64/arm64/pmap.c	Thu May 17 22:38:16 2018	(r333771)
+++ head/sys/arm64/arm64/pmap.c	Thu May 17 22:40:22 2018	(r333772)
@@ -487,6 +487,9 @@ pmap_get_tables(pmap_t pmap, vm_offset_t va, pd_entry_
 		return (true);
 	}
 
+	if ((pmap_load(l2p) & ATTR_DESCR_MASK) != L2_TABLE)
+		return (false);
+
 	*l3 = pmap_l2_to_l3(l2p, va);
 
 	return (true);