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How did this bug survive for so long? 'who am i' was busted because 

it checked for valid utmp entries with usr.ut_name != NULL which can
never happen ofcourse, instead of usr.ut_name[0] != '\0'
This commit is contained in:
christos 1999-07-17 16:41:44 +00:00
parent 936dae3338
commit 6653fa8b3c
1 changed files with 4 additions and 3 deletions
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7
usr.bin/who/who.c
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@ -1,4 +1,4 @@
/* $NetBSD: who.c,v 1.7 1998/12/20 14:53:24 christos Exp $ */
/* $NetBSD: who.c,v 1.8 1999/07/17 16:41:44 christos Exp $ */
/*
* Copyright (c) 1989, 1993
@ -47,7 +47,7 @@ __COPYRIGHT(
#if 0
static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: who.c,v 1.7 1998/12/20 14:53:24 christos Exp $");
__RCSID("$NetBSD: who.c,v 1.8 1999/07/17 16:41:44 christos Exp $");
#endif /* not lint */
#include <sys/types.h>
@ -165,7 +165,8 @@ who_am_i(ufp)
if ((t = strrchr(p, '/')) != NULL)
p = t + 1;
while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
if (usr.ut_name && !strcmp(usr.ut_line, p)) {
if (usr.ut_name[0] != '\0' &&
!strcmp(usr.ut_line, p)) {
output(&usr);
return;
}