[src/trunk]: src/sys/uvm CID-1427737: Pacify coverity using KASSERT

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e306e2540579
branches:  trunk
changeset: 358897:e306e2540579
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jan 21 17:58:43 2018 +0000

description:
CID-1427737: Pacify coverity using KASSERT

diffstat:

 sys/uvm/uvm_physseg.c |  11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diffs (33 lines):

diff -r 2636611cfcad -r e306e2540579 sys/uvm/uvm_physseg.c
--- a/sys/uvm/uvm_physseg.c     Sun Jan 21 17:34:33 2018 +0000
+++ b/sys/uvm/uvm_physseg.c     Sun Jan 21 17:58:43 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_physseg.c,v 1.8 2017/03/19 23:30:39 riastradh Exp $ */
+/* $NetBSD: uvm_physseg.c,v 1.9 2018/01/21 17:58:43 christos Exp $ */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -1147,9 +1147,9 @@
        struct uvm_physseg *seg;
        struct vm_page *pgs = NULL;
 
-       seg = HANDLE_TO_PHYSSEG_NODE(upm);
+       KASSERT(pages > 0);
 
-       KASSERT(pages > 0);
+       seg = HANDLE_TO_PHYSSEG_NODE(upm);
 
        if (__predict_false(seg->ext == NULL)) {
                /*
@@ -1161,7 +1161,10 @@
                 */
                KASSERT(uvm.page_init_done != true);
 
-               seg->ext = HANDLE_TO_PHYSSEG_NODE(uvm_physseg_get_prev(upm))->ext;
+               uvm_physseg_t upmp = uvm_physseg_get_prev(upm);
+               KASSERT(upmp != UVM_PHYSSEG_TYPE_INVALID);
+
+               seg->ext = HANDLE_TO_PHYSSEG_NODE(upmp)->ext;
 
                KASSERT(seg->ext != NULL);
        }