Patches attached:
Obtained from: NetBSD

(Committed there about 3 months ago after we first spotted the problem in
their implementation)

-- 
  Pascal Hofstee      < daeron @ shadowmere . student . utwente . nl >
  begin  LOVE-LETTER-FOR-YOU.TXT.vbs
         I'm a signature virus. Please copy me and help me spread.
  end
--- tftpd.8.orig        Wed Jan 31 11:59:57 2001
+++ tftpd.8     Wed Jan 31 12:04:55 2001
@@ -192,3 +192,9 @@
 .Fl c
 option was introduced in
 .Fx 5.0 .
+.Sh BUGS
+Files larger than 33488896 octets (65535 blocks) cannot be transferred
+without client and server supporting blocksize negotiation (RFC1783).
+.Pp
+Many tftp clients will not transfer files over 16744448 octets (32767 blocks).
+
--- tftpd.c.orig        Wed Jan 31 11:55:53 2001
+++ tftpd.c     Wed Jan 31 11:58:00 2001
@@ -501,7 +501,7 @@
        struct tftphdr *dp, *r_init();
        register struct tftphdr *ap;    /* ack packet */
        register int size, n;
-       volatile int block;
+       volatile unsigned int block;
 
        signal(SIGALRM, timer);
        dp = r_init();
@@ -571,7 +571,7 @@
        struct tftphdr *dp, *w_init();
        register struct tftphdr *ap;    /* ack buffer */
        register int n, size;
-       volatile int block;
+       volatile unsigned int block;
 
        signal(SIGALRM, timer);
        dp = w_init();

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