--- tftpd/src/srv.c	2014/02/24 22:02:19	1.7.2.2
+++ tftpd/src/srv.c	2014/02/24 22:21:46	1.7.2.3
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: srv.c,v 1.7.2.2 2014/02/24 22:02:19 misho Exp $
+* $Id: srv.c,v 1.7.2.3 2014/02/24 22:21:46 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -478,18 +478,19 @@ DATA(sched_task_t *task)
 
 	EVERBOSE(3, "DATA:: seq=%hu; len=%d", cli.seq, len);
 
-	if (!bf)
-		len = pwrite(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
-	else
-		len = bfwrite(cli.fd, RPACK_NEXT(pkt), len);
-	if (len == -1) {
-		ESYSERR(0);
-		code = htons(3);
-		goto end;
-	} else {
-		rpack_rnext(pkt, len);
-		EVERBOSE(3, "Written to file %s %d bytes", cli.file, len);
+	if (len > 0) {
+		if (!bf)
+			len = pwrite(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
+		else
+			len = bfwrite(cli.fd, RPACK_NEXT(pkt), len);
+		if (len == -1) {
+			ESYSERR(0);
+			code = htons(3);
+			goto end;
+		} else
+			rpack_rnext(pkt, len);
 	}
+	EVERBOSE(3, "Written to file %s %d bytes", cli.file, len);
 
 	schedEvent(TASK_ROOT(task), txAck, NULL, TASK_FD(task), TASK_DATA(task), 0);
 	taskExit(task, NULL);