The patch from the ipw2100 site that does fix the problem

ipw2100-1.1.0-wpa_supplicant-0.4.x.patch (text/plain), 469 bytes, created by Fredrik Karlsson on 2005-06-23 02:24:17 UTC

Common subdirectories: ipw2100-1.1.0-orig/ipw2100-1.1.0 and ipw2100-1.1.0/ipw2100-1.1.0
diff -Nup ipw2100-1.1.0-orig/ipw2100.c ipw2100-1.1.0/ipw2100.c
--- ipw2100-1.1.0-orig/ipw2100.c	2005-06-20 15:46:02.754390456 -0500
+++ ipw2100-1.1.0/ipw2100.c	2005-06-20 15:46:31.148073960 -0500
@@ -5762,7 +5762,8 @@ struct ipw2100_param {
 		} wpa_param;
 		struct {
 			u32 len;
-			u8 *data;
+			u8 reserved[32];
+			u8 data[0];
 		} wpa_ie;
 	        struct{
 			int command;