last: avoid out of bounds array access

diff --git a/login-utils/last.c b/login-utils/last.c
index bbbe817f8a99f1f543832d22e7fef168007d1f4a..f5a9fec0804c8b9bc435dd097f17d45688e6f379 100644 (file)
--- a/login-utils/last.c
+++ b/login-utils/last.c
@@ -351,7 +351,10 @@ static int time_formatter(int fmt, char *dst, size_t dlen, time_t *when)
        {
                char buf[CTIME_BUFSIZ];
 
-               ctime_r(when, buf);
+               if (!ctime_r(when, buf)) {
+                       ret = -1;
+                       break;
+               }
                snprintf(dst, dlen, "%s", buf);
                ret = rtrim_whitespace((unsigned char *) dst);
                break;