[src/trunk]: src/usr.bin/last Avoid SIGSEGV on out-of-range time_t.

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

details:   https://anonhg.NetBSD.org/src/rev/80cf3ae693e1
branches:  trunk
changeset: 755416:80cf3ae693e1
user:      dholland <dholland%NetBSD.org@localhost>
date:      Sat Jun 05 03:24:01 2010 +0000

description:
Avoid SIGSEGV on out-of-range time_t.

diffstat:

 usr.bin/last/last.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r 200c5e804173 -r 80cf3ae693e1 usr.bin/last/last.c
--- a/usr.bin/last/last.c       Sat Jun 05 03:02:37 2010 +0000
+++ b/usr.bin/last/last.c       Sat Jun 05 03:24:01 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: last.c,v 1.33 2009/04/12 13:07:21 lukem Exp $  */
+/*     $NetBSD: last.c,v 1.34 2010/06/05 03:24:01 dholland Exp $       */
 
 /*
  * Copyright (c) 1987, 1993, 1994
@@ -39,7 +39,7 @@
 #if 0
 static char sccsid[] = "@(#)last.c     8.2 (Berkeley) 4/2/94";
 #endif
-__RCSID("$NetBSD: last.c,v 1.33 2009/04/12 13:07:21 lukem Exp $");
+__RCSID("$NetBSD: last.c,v 1.34 2010/06/05 03:24:01 dholland Exp $");
 #endif /* not lint */
 
 #include <sys/param.h>
@@ -362,6 +362,10 @@
        static char tbuf[TBUFLEN];
 
        tm = (flags & GMT) ? gmtime(&t) : localtime(&t);
+       if (tm == NULL) {
+               strcpy(tbuf, "????");
+               return tbuf;
+       }
        strftime(tbuf, sizeof(tbuf),
            (flags & TIMEONLY)
             ? (flags & FULLTIME ? LTFMTS : TFMTS)