From: alex medvedev <[email protected]>

catch a segfault:
  option 81 min size should be 4 bytes:
    http://sunsite.uakom.sk/doc/rfc/bootp-dhcp-option-81

diff --git a/print-bootp.c b/print-bootp.c
index 410bde37c7f2f86a015e8451c658738e746253c2..cde864561701041b7038bf6afdd4e4775b86e0bc 100644 (file)
--- a/print-bootp.c
+++ b/print-bootp.c
@@ -22,7 +22,7 @@
  */
 #ifndef lint
 static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.77 2003-11-16 09:36:15 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.78 2004-03-02 07:38:10 hannes Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -556,6 +556,10 @@ rfc1048_print(register const u_char *bp)
                                break;
 
                        case TAG_CLIENT_FQDN:
+                               /* option 81 should be at least 4 bytes long */
+                               if (len < 4) 
+                                        printf("ERROR: options 81 len %u < 4 bytes", len);
+                                       break;
                                if (*bp++)
                                        printf("[svrreg]");
                                if (*bp)