[src/netbsd-9]: src/sys/uvm Pull up following revision(s) (requested by maxv ...

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

details:   https://anonhg.NetBSD.org/src/rev/94d94f356c99
branches:  netbsd-9
changeset: 1001028:94d94f356c99
user:      martin <martin%NetBSD.org@localhost>
date:      Mon Oct 21 20:17:31 2019 +0000

description:
Pull up following revision(s) (requested by maxv in ticket #355):

        sys/uvm/uvm_mmap.c: revision 1.173

Change 'npgs' from int to size_t. Otherwise the 64bit->32bit conversion
could lead to npgs=0, which is not expected. It later triggers a panic
in uvm_vsunlock().
Found by TriforceAFL (Akul Pillai).

diffstat:

 sys/uvm/uvm_mmap.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 6cc442ebbfe2 -r 94d94f356c99 sys/uvm/uvm_mmap.c
--- a/sys/uvm/uvm_mmap.c        Mon Oct 21 20:15:02 2019 +0000
+++ b/sys/uvm/uvm_mmap.c        Mon Oct 21 20:17:31 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_mmap.c,v 1.172 2019/04/06 03:06:29 thorpej Exp $   */
+/*     $NetBSD: uvm_mmap.c,v 1.172.4.1 2019/10/21 20:17:31 martin Exp $        */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -46,7 +46,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_mmap.c,v 1.172 2019/04/06 03:06:29 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_mmap.c,v 1.172.4.1 2019/10/21 20:17:31 martin Exp $");
 
 #include "opt_compat_netbsd.h"
 #include "opt_pax.h"
@@ -132,7 +132,8 @@
        vaddr_t start, end, lim;
        struct vm_map *map;
        vsize_t len;
-       int error = 0, npgs;
+       int error = 0;
+       size_t npgs;
 
        map = &p->p_vmspace->vm_map;