From db96f2a540e24e5ed025d0861f755d6bb187dbec Mon Sep 17 00:00:00 2001
From: ume <ume@FreeBSD.org>
Date: Sat, 14 Sep 2002 17:28:40 +0000
Subject: Limit UDP payload size for EDNS0 to 0xffff, not use lower 16bit
 value.

Obtained from:	KAME
---
 lib/libc/net/res_mkquery.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib')

diff --git a/lib/libc/net/res_mkquery.c b/lib/libc/net/res_mkquery.c
index f079e0d..7ef1ace 100644
--- a/lib/libc/net/res_mkquery.c
+++ b/lib/libc/net/res_mkquery.c
@@ -229,6 +229,8 @@ res_opt(n0, buf, buflen, anslen)
 
 	__putshort(T_OPT, cp);	/* TYPE */
 	cp += INT16SZ;
+	if (anslen > 0xffff)
+		anslen = 0xffff;		/* limit to 16bit value */
 	__putshort(anslen & 0xffff, cp);	/* CLASS = UDP payload size */
 	cp += INT16SZ;
 	*cp++ = NOERROR;	/* extended RCODE */
-- 
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