--- proftpd-1.3.0/contrib/mod_tls.c.org	2006-11-15 16:00:44.000000000 -0700
+++ proftpd-1.3.0/contrib/mod_tls.c	2006-11-15 16:02:02.000000000 -0700
@@ -2485,6 +2485,8 @@
      datalen = BIO_get_mem_data(mem, &data);
 
   if (data) {
+    if (datalen > sizeof(buf)-1)
+        datalen = sizeof(buf)-1;
     memset(&buf, '\0', sizeof(buf));
     memcpy(buf, data, datalen);
     buf[datalen] = '\0';