diff -urpN dnsmasq-2.56test8/src/rfc2131.c dnsmasq-2.56test9/src/rfc2131.c
--- dnsmasq-2.56test8/src/rfc2131.c	2010-09-08 15:31:13.000000000 -0600
+++ dnsmasq-2.56test9/src/rfc2131.c	2010-09-19 14:32:40.000000000 -0600
@@ -1244,6 +1244,7 @@ size_t dhcp_reply(struct dhcp_context *c
 	      
 	      lease->changed = 1;
 	      free(lease->extradata);
+	      lease->extradata = NULL;
 	      lease->extradata_size = lease->extradata_len = 0;
 	      
 	      add_extradata_opt(lease, option_find(mess, sz, OPTION_VENDOR_ID, 1));