[src/trunk]: src/usr.bin/mail more protection from unset threads from RVP

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

details:   https://anonhg.NetBSD.org/src/rev/909474dcdff6
branches:  trunk
changeset: 1027727:909474dcdff6
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Dec 17 13:14:54 2021 +0000

description:
more protection from unset threads from RVP

diffstat:

 usr.bin/mail/thread.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r 669c216cfa5e -r 909474dcdff6 usr.bin/mail/thread.c
--- a/usr.bin/mail/thread.c     Fri Dec 17 11:06:15 2021 +0000
+++ b/usr.bin/mail/thread.c     Fri Dec 17 13:14:54 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: thread.c,v 1.12 2021/12/14 21:12:03 christos Exp $     */
+/*     $NetBSD: thread.c,v 1.13 2021/12/17 13:14:54 christos Exp $     */
 
 /*-
  * Copyright (c) 2006 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
 
 #include <sys/cdefs.h>
 #ifndef __lint__
-__RCSID("$NetBSD: thread.c,v 1.12 2021/12/14 21:12:03 christos Exp $");
+__RCSID("$NetBSD: thread.c,v 1.13 2021/12/17 13:14:54 christos Exp $");
 #endif /* not __lint__ */
 
 #include <assert.h>
@@ -594,6 +594,8 @@
 
        if (mp == NULL)
                mp = current_thread.t_head;
+       if (mp == NULL)
+               return;
 
        if (mp == NULL)
                return NULL;
@@ -827,6 +829,9 @@
 {
        struct message *parent;
 
+       if (mcount == 0)
+               return;
+
        parent = marray[0].mp->m_plink;
        qsort(marray, mcount, sizeof(*marray), qsort_cmpfn);
        link_array(marray, mcount);