[file-roller] Prevent a NULL pointer deref in mktime_from_string(). It's possible to call mktime_from_string() wit

[Paolo Bacchilega <paobac src gnome org>]

commit 2899c092f249a4fa822a896baf128b6c8c75b634
Author: Jasper Lievisse Adriaanse <jasper humppa nl>
Date:   Mon May 23 13:11:30 2011 +0200

    Prevent a NULL pointer deref in mktime_from_string(). It's possible to call mktime_from_string() with NULL arguments for day, month and year. This would in turn lead to calling atoi(NULL), which leads to a crash.
    
    So instead fill in any NULL values with the corresponding unit from Jan 1st 1970.

 src/fr-command-rpm.c |   41 +++++++++++++++++++++++++----------------
 1 files changed, 25 insertions(+), 16 deletions(-)
---
diff --git a/src/fr-command-rpm.c b/src/fr-command-rpm.c
index c0560c5..c5bec5c 100644
--- a/src/fr-command-rpm.c
+++ b/src/fr-command-rpm.c
@@ -61,23 +61,32 @@ mktime_from_string (char *month,
 				tm.tm_mon = i;
 				break;
 			}
-	}
-	tm.tm_mday = atoi (mday);
-	if (strchr (year, ':') != NULL) {
-		char **fields = g_strsplit (year, ":", 2);
-        	if (n_fields (fields) == 2) {
-	        	time_t      now;
-        		struct tm  *now_tm;
-
-	  		tm.tm_hour = atoi (fields[0]);
-	  		tm.tm_min = atoi (fields[1]);
-
-	  		now = time(NULL);
-	  		now_tm = localtime (&now);
-	  		tm.tm_year = now_tm->tm_year;
-        	}
 	} else
-		tm.tm_year = atoi (year) - 1900;
+		tm.tm_mon = 0;
+
+	if (mday != NULL) 
+		tm.tm_mday = atoi (mday);
+	else
+		tm.tm_mday = 1;
+
+	if (year != NULL) {
+		if (strchr (year, ':') != NULL) {
+			char **fields = g_strsplit (year, ":", 2);
+	        	if (n_fields (fields) == 2) {
+		        	time_t      now;
+	        		struct tm  *now_tm;
+
+		  		tm.tm_hour = atoi (fields[0]);
+		  		tm.tm_min = atoi (fields[1]);
+
+		  		now = time(NULL);
+		  		now_tm = localtime (&now);
+		  		tm.tm_year = now_tm->tm_year;
+	        	}
+		} else
+			tm.tm_year = atoi (year) - 1900;
+	} else
+		tm.tm_year = 70;
 
 	return mktime (&tm);
 }