r16230: Fix Klocwork #861 and others. localtime and asctime

can return NULL. Ensure we check all returns correctly.
Jeremy.
(This used to be commit 6c61dc8ed6d84f310ef391fb7700e93ef42c4afc)

16 files changed, 276 insertions, 141 deletions

diff --git a/source3/auth/auth_sam.c b/source3/auth/auth_sam.c
index e8018eb13dd..ec405dd2be4 100644
--- a/source3/auth/auth_sam.c
+++ b/source3/auth/auth_sam.c
@@ -77,6 +77,7 @@ static BOOL logon_hours_ok(struct samu *sampass)
 	const uint8 *hours;
 	struct tm *utctime;
 	time_t lasttime;
+	const char *asct;
 	uint8 bitmask, bitpos;
 
 	hours = pdb_get_hours(sampass);
@@ -87,6 +88,11 @@ static BOOL logon_hours_ok(struct samu *sampass)
 
 	lasttime = time(NULL);
 	utctime = gmtime(&lasttime);
+	if (!utctime) {
+		DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
+			pdb_get_username(sampass) ));
+		return False;
+	}
 
 	/* find the corresponding byte and bit */
 	bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
@@ -94,15 +100,24 @@ static BOOL logon_hours_ok(struct samu *sampass)
 
 	if (! (hours[bitpos/8] & bitmask)) {
 		struct tm *t = localtime(&lasttime);
+		if (!t) {
+			asct = "INVALID TIME";
+		} else {
+			asct = asctime(t);
+			if (!asct) {
+				asct = "INVALID TIME";
+			}
+		}
+		
 		DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 			  "logon at this time (%s).\n",
-			  pdb_get_username(sampass),
-			  t ? asctime(t) : "INVALID TIME"));
+			  pdb_get_username(sampass), asct ));
 		return False;
 	}
 
+	asct = asctime(utctime);
 	DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
-		pdb_get_username(sampass), asctime(utctime) ));
+		pdb_get_username(sampass), asct ? asct : "UNKNOWN TIME" ));
 
 	return True;
 }
diff --git a/source3/auth/pass_check.c b/source3/auth/pass_check.c
index 507e8a3836e..d0a900b80f3 100644
--- a/source3/auth/pass_check.c
+++ b/source3/auth/pass_check.c
@@ -92,6 +92,7 @@ check on a DCE/DFS authentication
 ********************************************************************/
 static BOOL dfs_auth(char *user, char *password)
 {
+	struct tm *t;
 	error_status_t err;
 	int err2;
 	int prterr;
@@ -341,8 +342,13 @@ static BOOL dfs_auth(char *user, char *password)
 	set_effective_uid(0);
 	set_effective_gid(0);
 
-	DEBUG(0,
-	      ("DCE context expires: %s", asctime(localtime(&expire_time))));
+	t = localtime(&expire_time);
+	if (t) {
+		const char *asct = asctime(t);
+		if (asct) {
+			DEBUG(0,("DCE context expires: %s", asct));
+		}
+	}
 
 	dcelogin_atmost_once = 1;
 	return (True);
diff --git a/source3/client/client.c b/source3/client/client.c
index 1fbee70645c..aa25d9aba5b 100644
--- a/source3/client/client.c
+++ b/source3/client/client.c
@@ -379,7 +379,7 @@ static void display_finfo(file_info *finfo)
 			 finfo->name,
 			 attrib_string(finfo->mode),
 			 (double)finfo->size,
-			 asctime(localtime(&t)));
+			 time_to_asc(&t));
 		dir_total += finfo->size;
 	}
 }
@@ -2111,6 +2111,7 @@ static int cmd_stat(void)
 	fstring mode_str;
 	SMB_STRUCT_STAT sbuf;
 	struct cli_state *targetcli;
+	struct tm *lt;
 	pstring targetname;
  
 	if (!SERVER_HAS_UNIX_CIFS(cli)) {
@@ -2165,13 +2166,28 @@ static int cmd_stat(void)
 		(unsigned int)sbuf.st_uid, 
 		(unsigned int)sbuf.st_gid);
 
-	strftime(mode_str, sizeof(mode_str), "%F %T %z", localtime(&sbuf.st_atime));
+	lt = localtime(&sbuf.st_atime);
+	if (lt) {
+		strftime(mode_str, sizeof(mode_str), "%F %T %z", lt);
+	} else {
+		fstrcpy(mode_str, "unknown");
+	}
 	d_printf("Access: %s\n", mode_str);
 
-	strftime(mode_str, sizeof(mode_str), "%F %T %z", localtime(&sbuf.st_mtime));
+	lt = localtime(&sbuf.st_mtime);
+	if (lt) {
+		strftime(mode_str, sizeof(mode_str), "%F %T %z", lt);
+	} else {
+		fstrcpy(mode_str, "unknown");
+	}
 	d_printf("Modify: %s\n", mode_str);
 
-	strftime(mode_str, sizeof(mode_str), "%F %T %z", localtime(&sbuf.st_ctime));
+	lt = localtime(&sbuf.st_ctime);
+	if (lt) {
+		strftime(mode_str, sizeof(mode_str), "%F %T %z", lt);
+	} else {
+		fstrcpy(mode_str, "unknown");
+	}
 	d_printf("Change: %s\n", mode_str);
 	
 	return 0;
@@ -2339,7 +2355,7 @@ static int cmd_newer(void)
 	if (ok && (sys_stat(buf,&sbuf) == 0)) {
 		newer_than = sbuf.st_mtime;
 		DEBUG(1,("Getting files newer than %s",
-			 asctime(localtime(&newer_than))));
+			 time_to_asc(&newer_than)));
 	} else {
 		newer_than = 0;
 	}
diff --git a/source3/client/clitar.c b/source3/client/clitar.c
index a7bc4bfde34..14c28acfc5a 100644
--- a/source3/client/clitar.c
+++ b/source3/client/clitar.c
@@ -1641,7 +1641,7 @@ int tar_parseargs(int argc, char *argv[], const char *Optarg, int Optind)
 					if (sys_stat(argv[Optind], &stbuf) == 0) {
 						newer_than = stbuf.st_mtime;
 						DEBUG(1,("Getting files newer than %s",
-							asctime(localtime(&newer_than))));
+							time_to_asc(&newer_than)));
 						newOptind++;
 						Optind++;
 					} else {
diff --git a/source3/client/smbctool.c b/source3/client/smbctool.c
index ba095aee84e..5b21d195b76 100644
--- a/source3/client/smbctool.c
+++ b/source3/client/smbctool.c
@@ -445,7 +445,7 @@ static void display_finfo(file_info *finfo)
 			 finfo->name,
 			 attrib_string(finfo->mode),
 			 (double)finfo->size,
-			 asctime(localtime(&t)));
+			 time_to_asc(&t));
 		dir_total += finfo->size;
 	}
 }
@@ -458,7 +458,7 @@ static void display_stat(char *name, struct stat *st)
 {
 	time_t t = st->st_mtime;
 	pstring time_str;
-	pstrcpy(time_str, asctime(localtime(&t)));
+	pstrcpy(time_str, time_to_asc(&t));
 	time_str[strlen(time_str)-1] = 0;
 	d_printf("> %-30s", name);
 	d_printf("%10.10s %8.0f  %s\n", *mode_t_string(st->st_mode), (double)st->st_size, time_str);
@@ -2303,6 +2303,7 @@ static int cmd_stat(void)
 	fstring mode_str;
 	SMB_STRUCT_STAT sbuf;
 	struct cli_state *targetcli;
+	struct tm *lt;
 	pstring targetname;
  
 	if (!SERVER_HAS_UNIX_CIFS(cli)) {
@@ -2357,15 +2358,30 @@ static int cmd_stat(void)
 		(unsigned int)sbuf.st_uid, 
 		(unsigned int)sbuf.st_gid);
 
-	strftime(mode_str, sizeof(mode_str), "%F %T %z", localtime(&sbuf.st_atime));
+	lt = localtime(&sbuf.st_atime);
+	if (lt) {
+		strftime(mode_str, sizeof(mode_str), "%F %T %z", lt);
+	} else {
+		fstrcpy(mode_str, "unknown");
+	}
 	d_printf("Access: %s\n", mode_str);
 
-	strftime(mode_str, sizeof(mode_str), "%F %T %z", localtime(&sbuf.st_mtime));
+	lt = localtime(&sbuf.st_mtime);
+	if (lt) {
+		strftime(mode_str, sizeof(mode_str), "%F %T %z", lt);
+	} else {
+		fstrcpy(mode_str, "unknown");
+	}
 	d_printf("Modify: %s\n", mode_str);
 
-	strftime(mode_str, sizeof(mode_str), "%F %T %z", localtime(&sbuf.st_ctime));
+	lt = localtime(&sbuf.st_ctime);
+	if (lt) {
+		strftime(mode_str, sizeof(mode_str), "%F %T %z", lt);
+	} else {
+		fstrcpy(mode_str, "unknown");
+	}
 	d_printf("Change: %s\n", mode_str);
-	
+
 	return 0;
 }
 
@@ -2538,7 +2554,7 @@ static int cmd_newer(void)
 	if (ok && (sys_stat(buf,&sbuf) == 0)) {
 		newer_than = sbuf.st_mtime;
 		DEBUG(1,("Getting files newer than %s",
-			 asctime(localtime(&newer_than))));
+			 time_to_asc(&newer_than)));
 	} else {
 		newer_than = 0;
 	}
diff --git a/source3/lib/replace.c b/source3/lib/replace.c
index 9ef3503d39f..19b37af9386 100644
--- a/source3/lib/replace.c
+++ b/source3/lib/replace.c
@@ -95,49 +95,50 @@ Corrections by richard.kettlewell@kewill.com
 #define  YEAR    365*DAY
  time_t mktime(struct tm *t)
 {
-  struct tm       *u;
-  time_t  epoch = 0;
-  int n;
-  int             mon [] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
-  y, m, i;
-
-  if(t->tm_year < 70)
-    return((time_t)-1);
-
-  n = t->tm_year + 1900 - 1;
-  epoch = (t->tm_year - 70) * YEAR + 
-    ((n / 4 - n / 100 + n / 400) - (1969 / 4 - 1969 / 100 + 1969 / 400)) * DAY;
-
-  y = t->tm_year + 1900;
-  m = 0;
-
-  for(i = 0; i < t->tm_mon; i++) {
-    epoch += mon [m] * DAY;
-    if(m == 1 && y % 4 == 0 && (y % 100 != 0 || y % 400 == 0))
-      epoch += DAY;
+	struct tm       *u;
+	time_t  epoch = 0;
+	int n;
+	int             mon [] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+	y, m, i;
+
+	if(t->tm_year < 70) {
+		return((time_t)-1);
+	}
+
+	n = t->tm_year + 1900 - 1;
+	epoch = (t->tm_year - 70) * YEAR + ((n / 4 - n / 100 + n / 400) - (1969 / 4 - 1969 / 100 + 1969 / 400)) * DAY;
+
+	y = t->tm_year + 1900;
+	m = 0;
+
+	for(i = 0; i < t->tm_mon; i++) {
+		epoch += mon [m] * DAY;
+		if(m == 1 && y % 4 == 0 && (y % 100 != 0 || y % 400 == 0)) {
+			epoch += DAY;
+		}
     
-    if(++m > 11) {
-      m = 0;
-      y++;
-    }
-  }
-
-  epoch += (t->tm_mday - 1) * DAY;
-  epoch += t->tm_hour * HOUR + t->tm_min * MINUTE + t->tm_sec;
+		if(++m > 11) {
+			m = 0;
+			y++;
+		}
+	}
+
+	epoch += (t->tm_mday - 1) * DAY;
+	epoch += t->tm_hour * HOUR + t->tm_min * MINUTE + t->tm_sec;
   
-  if((u = localtime(&epoch)) != NULL) {
-    t->tm_sec = u->tm_sec;
-    t->tm_min = u->tm_min;
-    t->tm_hour = u->tm_hour;
-    t->tm_mday = u->tm_mday;
-    t->tm_mon = u->tm_mon;
-    t->tm_year = u->tm_year;
-    t->tm_wday = u->tm_wday;
-    t->tm_yday = u->tm_yday;
-    t->tm_isdst = u->tm_isdst;
-  }
-
-  return(epoch);
+	if((u = localtime(&epoch)) != NULL) {
+		t->tm_sec = u->tm_sec;
+		t->tm_min = u->tm_min;
+		t->tm_hour = u->tm_hour;
+		t->tm_mday = u->tm_mday;
+		t->tm_mon = u->tm_mon;
+		t->tm_year = u->tm_year;
+		t->tm_wday = u->tm_wday;
+		t->tm_yday = u->tm_yday;
+		t->tm_isdst = u->tm_isdst;
+	}
+
+	return(epoch);
 }
 #endif /* !HAVE_MKTIME */
 
@@ -147,15 +148,15 @@ Corrections by richard.kettlewell@kewill.com
 /* Rename a file. (from libiberty in GNU binutils)  */
  int rename(const char *zfrom, const char *zto)
 {
-  if (link (zfrom, zto) < 0)
-    {
-      if (errno != EEXIST)
-	return -1;
-      if (unlink (zto) < 0
-	  || link (zfrom, zto) < 0)
-	return -1;
-    }
-  return unlink (zfrom);
+	if (link (zfrom, zto) < 0) {
+		if (errno != EEXIST) {
+			return -1;
+		}
+		if (unlink (zto) < 0 || link (zfrom, zto) < 0) {
+			return -1;
+		}
+	}
+	return unlink (zfrom);
 }
 #endif /* HAVE_RENAME */
 
diff --git a/source3/lib/time.c b/source3/lib/time.c
index f8a1538910c..9a539d415e8 100644
--- a/source3/lib/time.c
+++ b/source3/lib/time.c
@@ -615,16 +615,19 @@ char *http_timestring(time_t t)
 	static fstring buf;
 	struct tm *tm = localtime(&t);
 
-	if (!tm)
+	if (!tm) {
 		slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
-	else
+	} else {
 #ifndef HAVE_STRFTIME
-		fstrcpy(buf, asctime(tm));
-	if(buf[strlen(buf)-1] == '\n')
+		const char *asct = asctime(tm);
+		fstrcpy(buf, asct ? asct : "unknown");
+	}
+	if(buf[strlen(buf)-1] == '\n') {
 		buf[strlen(buf)-1] = 0;
 #else /* !HAVE_STRFTIME */
 		strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
 #endif /* !HAVE_STRFTIME */
+	}
 	return buf;
 }
 
@@ -672,13 +675,15 @@ char *timestring(BOOL hires)
 		}
 #else
 		if (hires) {
+			const char *asct = asctime(tm);
 			slprintf(TimeBuf, 
 				 sizeof(TimeBuf)-1, 
 				 "%s.%06ld", 
-				 asctime(tm), 
+				 asct ? asct : "unknown", 
 				 (long)tp.tv_usec);
 		} else {
-			fstrcpy(TimeBuf, asctime(tm));
+			const char *asct = asctime(tm);
+			fstrcpy(TimeBuf, asct ? asct : "unknown");
 		}
 #endif
 	}
@@ -1050,3 +1055,24 @@ struct timespec get_create_timespec(SMB_STRUCT_STAT *st,BOOL fake_dirs)
 	return ret;
 }
 #endif
+
+/****************************************************************************
+ Utility function that always returns a const string even if localtime
+ and asctime fail.
+****************************************************************************/
+
+const char *time_to_asc(const time_t *t)
+{
+	const char *asct;
+	struct tm *lt = localtime(t);
+
+	if (!lt) {
+		return "unknown time";
+	}
+
+	asct = asctime(lt);
+	if (!asct) {
+		return "unknown time";
+	}
+	return asct;
+}
diff --git a/source3/nmbd/nmbd_namelistdb.c b/source3/nmbd/nmbd_namelistdb.c
index 60023a7ed5e..fb32ce1aad1 100644
--- a/source3/nmbd/nmbd_namelistdb.c
+++ b/source3/nmbd/nmbd_namelistdb.c
@@ -564,15 +564,31 @@ void dump_name_record( struct name_record *namerec, XFILE *fp)
 	x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
 
 	if(namerec->data.death_time != PERMANENT_TTL) {
+		const char *asct;
 		tm = localtime(&namerec->data.death_time);
-		x_fprintf(fp, "death_time = %s\t", asctime(tm));
+		if (!tm) {
+			return;
+		}
+		asct = asctime(tm);
+		if (!asct) {
+			return;
+		}
+		x_fprintf(fp, "death_time = %s\t", asct);
 	} else {
 		x_fprintf(fp, "death_time = PERMANENT\t");
 	}
 
 	if(namerec->data.refresh_time != PERMANENT_TTL) {
+		const char *asct;
 		tm = localtime(&namerec->data.refresh_time);
-		x_fprintf(fp, "refresh_time = %s\n", asctime(tm));
+		if (!tm) {
+			return;
+		}
+		asct = asctime(tm);
+		if (!asct) {
+			return;
+		}
+		x_fprintf(fp, "refresh_time = %s\n", asct);
 	} else {
 		x_fprintf(fp, "refresh_time = PERMANENT\n");
 	}
diff --git a/source3/nmbd/nmbd_winsserver.c b/source3/nmbd/nmbd_winsserver.c
index 198d90f35a1..29d5c41de82 100644
--- a/source3/nmbd/nmbd_winsserver.c
+++ b/source3/nmbd/nmbd_winsserver.c
@@ -2222,7 +2222,13 @@ void wins_write_name_record(struct name_record *namerec, XFILE *fp)
 		char *ts, *nl;
 
 		tm = localtime(&namerec->data.death_time);
+		if (!tm) {
+			return;
+		}
 		ts = asctime(tm);
+		if (!ts) {
+			return;
+		}
 		nl = strrchr( ts, '\n' );
 		if( NULL != nl ) {
 			*nl = '\0';
diff --git a/source3/printing/lpq_parse.c b/source3/printing/lpq_parse.c
index 7e81b5187c9..324d0fa90dc 100644
--- a/source3/printing/lpq_parse.c
+++ b/source3/printing/lpq_parse.c
@@ -25,50 +25,62 @@ static const char *Months[13] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 
 
 /*******************************************************************
-process time fields
+ Process time fields
 ********************************************************************/
+
 static time_t EntryTime(fstring tok[], int ptr, int count, int minimum)
 {
-  time_t jobtime,jobtime1;
-
-  jobtime = time(NULL);		/* default case: take current time */
-  if (count >= minimum) {
-    struct tm *t;
-    int i, day, hour, min, sec;
-    char   *c;
-
-    for (i=0; i<13; i++) if (!strncmp(tok[ptr], Months[i],3)) break; /* Find month */
-    if (i<12) {
-      t = localtime(&jobtime);
-      day = atoi(tok[ptr+1]);
-      c=(char *)(tok[ptr+2]);
-      *(c+2)=0;
-      hour = atoi(c);
-      *(c+5)=0;
-      min = atoi(c+3);
-      if(*(c+6) != 0)sec = atoi(c+6);
-      else  sec=0;
-
-      if ((t->tm_mon < i)||
-	  ((t->tm_mon == i)&&
-	   ((t->tm_mday < day)||
-	    ((t->tm_mday == day)&&
-	     (t->tm_hour*60+t->tm_min < hour*60+min)))))
-	t->tm_year--;		/* last year's print job */
-
-      t->tm_mon = i;
-      t->tm_mday = day;
-      t->tm_hour = hour;
-      t->tm_min = min;
-      t->tm_sec = sec;
-      jobtime1 = mktime(t);
-      if (jobtime1 != (time_t)-1)
-	jobtime = jobtime1;
-    }
-  }
-  return jobtime;
-}
+	time_t jobtime,jobtime1;
+
+	jobtime = time(NULL);		/* default case: take current time */
+	if (count >= minimum) {
+		struct tm *t;
+		int i, day, hour, min, sec;
+		char   *c;
+
+		for (i=0; i<13; i++) {
+			if (!strncmp(tok[ptr], Months[i],3)) {
+				break; /* Find month */
+			}
+		}
 
+		if (i<12) {
+			t = localtime(&jobtime);
+			if (!t) {
+				return (time_t)-1;
+			}
+			day = atoi(tok[ptr+1]);
+			c=(char *)(tok[ptr+2]);
+			*(c+2)=0;
+			hour = atoi(c);
+			*(c+5)=0;
+			min = atoi(c+3);
+			if(*(c+6) != 0) {
+				sec = atoi(c+6);
+			} else {
+				sec=0;
+			}
+
+			if ((t->tm_mon < i)|| ((t->tm_mon == i)&&
+					((t->tm_mday < day)||
+					((t->tm_mday == day)&&
+					(t->tm_hour*60+t->tm_min < hour*60+min))))) {
+				t->tm_year--;		/* last year's print job */
+			}
+
+			t->tm_mon = i;
+			t->tm_mday = day;
+			t->tm_hour = hour;
+			t->tm_min = min;
+			t->tm_sec = sec;
+			jobtime1 = mktime(t);
+			if (jobtime1 != (time_t)-1) {
+				jobtime = jobtime1;
+			}
+		}
+	}
+	return jobtime;
+}
 
 /****************************************************************************
 parse a lpq line
@@ -190,24 +202,27 @@ With lprng 3.16 The lpq time looks like
 static time_t LPRng_time(char *time_string)
 {
 	time_t jobtime;
-	struct tm t;
+	struct tm *t;
 
 	jobtime = time(NULL);         /* default case: take current time */
-	t = *localtime(&jobtime);
+	t = localtime(&jobtime);
+	if (!t) {
+		return (time_t)-1;
+	}
 
 	if ( atoi(time_string) < 24 ){
-		t.tm_hour = atoi(time_string);
-		t.tm_min = atoi(time_string+3);
-		t.tm_sec = atoi(time_string+6);
+		t->tm_hour = atoi(time_string);
+		t->tm_min = atoi(time_string+3);
+		t->tm_sec = atoi(time_string+6);
 	} else {
-		t.tm_year = atoi(time_string)-1900;
-		t.tm_mon = atoi(time_string+5)-1;
-		t.tm_mday = atoi(time_string+8);
-		t.tm_hour = atoi(time_string+11);
-		t.tm_min = atoi(time_string+14);
-		t.tm_sec = atoi(time_string+17);
+		t->tm_year = atoi(time_string)-1900;
+		t->tm_mon = atoi(time_string+5)-1;
+		t->tm_mday = atoi(time_string+8);
+		t->tm_hour = atoi(time_string+11);
+		t->tm_min = atoi(time_string+14);
+		t->tm_sec = atoi(time_string+17);
 	}    
-	jobtime = mktime(&t);
+	jobtime = mktime(t);
 
 	return jobtime;
 }
diff --git a/source3/smbd/lanman.c b/source3/smbd/lanman.c
index 4d4d9d22591..7d1a2ade544 100644
--- a/source3/smbd/lanman.c
+++ b/source3/smbd/lanman.c
@@ -2212,6 +2212,9 @@ static BOOL api_NetRemoteTOD(connection_struct *conn,uint16 vuid, char *param,ch
 	/* the client expects to get localtime, not GMT, in this bit 
 		(I think, this needs testing) */
 	t = localtime(&unixdate);
+	if (!t) {
+		return False;
+	}
 
 	SIVAL(p,4,0);		/* msecs ? */
 	SCVAL(p,8,t->tm_hour);
diff --git a/source3/utils/net_cache.c b/source3/utils/net_cache.c
index 0c107a5f01d..69b3327f7a9 100644
--- a/source3/utils/net_cache.c
+++ b/source3/utils/net_cache.c
@@ -37,24 +37,36 @@
 static void print_cache_entry(const char* keystr, const char* datastr,
                               const time_t timeout, void* dptr)
 {
-	char* timeout_str;
+	char *timeout_str;
 	time_t now_t = time(NULL);
 	struct tm timeout_tm, *now_tm;
 	/* localtime returns statically allocated pointer, so timeout_tm
 	   has to be copied somewhere else */
-	memcpy(&timeout_tm, localtime(&timeout), sizeof(struct tm));
+
+	now_tm = localtime(&timeout);
+	if (!now_tm) {
+		return;
+	}
+	memcpy(&timeout_tm, now_tm, sizeof(struct tm));
 	now_tm = localtime(&now_t);
+	if (!now_tm) {
+		return;
+	}
 
 	/* form up timeout string depending whether it's today's date or not */
 	if (timeout_tm.tm_year != now_tm->tm_year ||
-	    timeout_tm.tm_mon != now_tm->tm_mon ||
-	    timeout_tm.tm_mday != now_tm->tm_mday) {
+			timeout_tm.tm_mon != now_tm->tm_mon ||
+			timeout_tm.tm_mday != now_tm->tm_mday) {
 	    
-	    timeout_str = asctime(&timeout_tm);
-	    timeout_str[strlen(timeout_str) - 1] = '\0';	/* remove tailing CR */
-	} else
+		timeout_str = asctime(&timeout_tm);
+		if (!timeout_str) {
+			return;
+		}	
+		timeout_str[strlen(timeout_str) - 1] = '\0';	/* remove tailing CR */
+	} else {
 		asprintf(&timeout_str, "%.2d:%.2d:%.2d", timeout_tm.tm_hour,
 		         timeout_tm.tm_min, timeout_tm.tm_sec);
+	}
 	
 	d_printf("Key: %s\t Timeout: %s\t Value: %s  %s\n", keystr,
 	         timeout_str, datastr, timeout > now_t ? "": "(expired)");
diff --git a/source3/utils/net_status.c b/source3/utils/net_status.c
index d85bd27b16d..c68c9f6e2fb 100644
--- a/source3/utils/net_status.c
+++ b/source3/utils/net_status.c
@@ -104,7 +104,7 @@ static int show_share(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
 	d_printf("%-10.10s   %s   %-12s  %s",
 	       crec.name,procid_str_static(&crec.pid),
 	       crec.machine,
-	       asctime(localtime(&crec.start)));
+	       time_to_asc(&crec.start));
 
 	return 0;
 }
@@ -173,7 +173,7 @@ static int show_share_parseable(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf,
 		 guest ? "" : gidtoname(ids->entries[i].gid),
 		 crec.machine, 
 		 guest ? "" : ids->entries[i].hostname,
-		 asctime(localtime(&crec.start)));
+		 time_to_asc(&crec.start));
 
 	return 0;
 }
diff --git a/source3/utils/net_time.c b/source3/utils/net_time.c
index 1a7116d447d..f6486286a65 100644
--- a/source3/utils/net_time.c
+++ b/source3/utils/net_time.c
@@ -69,12 +69,15 @@ static time_t nettime(int *zone)
 }
 
 /* return a time as a string ready to be passed to /bin/date */
-static char *systime(time_t t)
+static const char *systime(time_t t)
 {
 	static fstring s;
 	struct tm *tm;
 
 	tm = localtime(&t);
+	if (!tm) {
+		return "unknown";
+	}
 	
 	fstr_sprintf(s, "%02d%02d%02d%02d%04d.%02d", 
 		 tm->tm_mon+1, tm->tm_mday, tm->tm_hour, 
diff --git a/source3/utils/status.c b/source3/utils/status.c
index 05075da444f..2566c8a50de 100644
--- a/source3/utils/status.c
+++ b/source3/utils/status.c
@@ -155,7 +155,7 @@ static void print_share_mode(const struct share_mode_entry *e, const char *share
 			d_printf("NONE            ");
 		}
 
-		d_printf(" %s   %s   %s",sharepath, fname, asctime(localtime((time_t *)&e->time.tv_sec)));
+		d_printf(" %s   %s   %s",sharepath, fname, time_to_asc((time_t *)&e->time.tv_sec));
 	}
 }
 
@@ -562,7 +562,7 @@ static int traverse_fn1(TDB_CONTEXT *tdb, TDB_DATA kbuf, TDB_DATA dbuf, void *st
 	d_printf("%-10s   %s   %-12s  %s",
 	       crec.name,procid_str_static(&crec.pid),
 	       crec.machine,
-	       asctime(localtime(&crec.start)));
+	       time_to_asc(&crec.start));
 
 	return 0;
 }
diff --git a/source3/web/statuspage.c b/source3/web/statuspage.c
index 7430f4ebf59..769ab217b3e 100644
--- a/source3/web/statuspage.c
+++ b/source3/web/statuspage.c
@@ -101,7 +101,7 @@ static char *mapPid2Machine (struct process_id pid)
 static char *tstring(time_t t)
 {
 	static pstring buf;
-	pstrcpy(buf, asctime(localtime(&t)));
+	pstrcpy(buf, time_to_asc(&t));
 	all_string_sub(buf," ","&nbsp;",sizeof(buf));
 	return buf;
 }