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

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

details:   https://anonhg.NetBSD.org/src/rev/53c56f421bfe
branches:  netbsd-9
changeset: 462660:53c56f421bfe
user:      martin <martin%NetBSD.org@localhost>
date:      Tue Oct 15 19:05:38 2019 +0000

description:
Pull up following revision(s) (requested by kamil in ticket #322):

        sys/kern/sysv_msg.c: revision 1.76

Avoid -LONG_MIN msgtyp in msgrcv(2) and treat it as LONG_MAX

This logic (found in Linux) avoids undefined behavior.

diffstat:

 sys/kern/sysv_msg.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 867943e3ebfb -r 53c56f421bfe sys/kern/sysv_msg.c
--- a/sys/kern/sysv_msg.c       Tue Oct 15 19:03:20 2019 +0000
+++ b/sys/kern/sysv_msg.c       Tue Oct 15 19:05:38 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sysv_msg.c,v 1.74 2019/04/10 10:03:50 pgoyette Exp $   */
+/*     $NetBSD: sysv_msg.c,v 1.74.4.1 2019/10/15 19:05:38 martin Exp $ */
 
 /*-
  * Copyright (c) 1999, 2006, 2007 The NetBSD Foundation, Inc.
@@ -50,7 +50,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: sysv_msg.c,v 1.74 2019/04/10 10:03:50 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: sysv_msg.c,v 1.74.4.1 2019/10/15 19:05:38 martin Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_sysv.h"
@@ -1104,6 +1104,7 @@
                                 */
 
                                if (msgtyp != msghdr->msg_type &&
+                                   msgtyp != LONG_MIN &&
                                    msghdr->msg_type > -msgtyp)
                                        continue;