1 files changed, 6 insertions, 0 deletions
diff --git a/time/bug-asctime_r.c b/time/bug-asctime_r.c
index 2579a6a3b0..86651ef1c5 100644
--- a/time/bug-asctime_r.c
+++ b/time/bug-asctime_r.c
@@ -13,12 +13,18 @@ do_test (void)
   tp->tm_year = 10000 - 1900;
   char buf[1000];
   errno = 0;
+  buf[26] = '\xff';
   char *s = asctime_r (tp, buf);
   if (s != NULL || errno != EOVERFLOW)
     {
       puts ("asctime_r did not fail correctly");
       result = 1;
     }
+  if (buf[26] != '\xff')
+    {
+      puts ("asctime_r overwrote 27th byte in buffer");
+      result = 1;
+    }
   return result;
 }