protect potential overflow for x86_64

diff --git a/miscutils/last.c b/miscutils/last.c
index d7ce5e775bc689f474230d215beb6baba99f9151..72386ea940dfbc2019d2602b50b27d195e8ca4d7 100644 (file)
--- a/miscutils/last.c
+++ b/miscutils/last.c
@@ -47,6 +47,7 @@ extern int last_main(int argc, char **argv)
 {
        struct utmp ut;
        int n, file = STDIN_FILENO;
+       time_t t_tmp;
 
        if (argc > 1) {
                bb_show_usage();
@@ -98,9 +99,9 @@ extern int last_main(int argc, char **argv)
                                        break;
                        }
                }
-
+               t_tmp = (time_t)ut.ut_tv.tv_sec;
                printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
-                               ctime((time_t *)&(ut.ut_tv.tv_sec)) + 4);
+                               ctime(&t_tmp) + 4);
        }
 
        bb_fflush_stdout_and_exit(EXIT_SUCCESS);