diff -ru /cvs/sys_old/netncp/ncp_rq.c /usr/src/sys/netncp/ncp_rq.c
--- /cvs/sys_old/netncp/ncp_rq.c	Sun Dec 24 16:01:24 2000
+++ /usr/src/sys/netncp/ncp_rq.c	Sun Dec 24 20:02:52 2000
@@ -62,7 +62,7 @@
 	rqp->cred = cred;
 	m = m_gethdr(M_TRYWAIT, MT_DATA);
 	if (m == NULL) 
-		return ENOBUFS;		/* if M_TRYWAIT ? */
+		return ENOBUFS;
 	m->m_pkthdr.rcvif = NULL;
 	rqp->rq = rqp->mrq = m;
 	rqp->rp = NULL;
@@ -107,13 +107,17 @@
 	while (rest > 0) {
 /*	NCPSDEBUG("%d\n",rest);*/
 		m = m_get(M_TRYWAIT, MT_DATA);
+		if (m == NULL) {
+			m_freem(top);
+			return;
+		}
 		if (rest > MINCLSIZE) {
-			MCLGET(m,M_TRYWAIT);
+			MCLGET(m, M_TRYWAIT);
 			mlen = ( (m->m_flags & M_EXT) == 0) ? MLEN : MCLBYTES;
 		} else { 
 			mlen = MLEN;
 		}
-		m->m_len = 0/*min(mlen,rest)*/;
+		m->m_len = 0; /* min(mlen,rest) */
 		mp->m_next = m;
 		mp = m;
 		rest -= mlen;
@@ -136,6 +140,8 @@
 	if (M_TRAILINGSPACE(rqp->mrq)<(size)) {
 		struct mbuf *m;
 		m = m_get(M_TRYWAIT, MT_DATA);
+		if (m == NULL)
+			return;
 		m->m_len = 0;
 		rqp->bpos = mtod(m, caddr_t);
 		rqp->mrq->m_next = m;
@@ -556,8 +562,23 @@
 			mlen = M_TRAILINGSPACE(mp);
 			if (mlen == 0) {
 				MGET(mp, M_TRYWAIT, MT_DATA);
-				if (clflg)
+				if (mp == NULL) {
+					if ((*mq)->m_next != NULL)
+						/* XXX: Is this OK? */
+						m_freem((*mq)->m_next);
+					m_free(mp);
+					return ENOBUFS;
+				}
+				if (clflg) {
 					MCLGET(mp, M_TRYWAIT);
+					if ((mp->m_ext & M_EXT) == 0) {
+						if ((*mq)->m_next != NULL)
+							/* XXX: Is this OK? */
+							m_freem((*mq)->m_next);
+						m_free(mp);
+						return ENOBUFS;
+					}
+				}
 				mp->m_len = 0;
 				mp2->m_next = mp;
 				mp2 = mp;