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| author | Ted Lemon <source@isc.org> | 2000-10-15 18:54:29 +0000 |
|---|---|---|
| committer | Ted Lemon <source@isc.org> | 2000-10-15 18:54:29 +0000 |
| commit | e28dccc15987111e8bc90a6ee535dbeb58dfaf46 (patch) | |
| tree | 33595e6a6bb6f6bb3966cbae704712eea6e9c863 | |
| parent | 848c25472ad28139bab194474bdb77a7792c8461 (diff) | |
| download | isc-dhcp-e28dccc15987111e8bc90a6ee535dbeb58dfaf46.tar.gz | |
Fix the math in the udp packet length calculator.
| -rw-r--r-- | common/packet.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/common/packet.c b/common/packet.c index 28bea1be..a34aae19 100644 --- a/common/packet.c +++ b/common/packet.c @@ -42,7 +42,7 @@ #ifndef lint static char copyright[] = -"$Id: packet.c,v 1.38 2000/10/14 07:56:59 mellon Exp $ Copyright (c) 1996-2000 The Internet Software Consortium. All rights reserved.\n"; +"$Id: packet.c,v 1.39 2000/10/15 18:54:29 mellon Exp $ Copyright (c) 1996-2000 The Internet Software Consortium. All rights reserved.\n"; #endif /* not lint */ #include "dhcpd.h" @@ -254,7 +254,8 @@ ssize_t decode_udp_ip_header (interface, buf, bufix, from, data, buflen) #endif /* USERLAND_FILTER */ ulen = ntohs (udp -> uh_ulen); - if (ulen < sizeof udp || ((unsigned char *)udp) + ulen > buf + buflen) { + if (ulen < sizeof *udp || + ((unsigned char *)udp) + ulen > buf + bufix + buflen) { log_info ("bogus UDP packet length: %d", ulen); return -1; } |