--- linux/drivers/net/ppp_generic.c.orig	Mon Feb 25 11:37:59 2002
+++ linux/drivers/net/ppp_generic.c	Mon Mar 25 10:19:53 2002
@@ -1006,8 +1006,15 @@
 	/* try to do packet compression */
 	if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0
 	    && proto != PPP_LCP && proto != PPP_CCP) {
-		new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len,
-				    GFP_ATOMIC);
+		int new_skb_size = ppp->dev->mtu + ppp->dev->hard_header_len;
+		int compressor_skb_size = ppp->dev->mtu + PPP_HDRLEN;
+
+		if (ppp->xcomp->compress_proto == CI_MPPE) {
+			/* CCP [must have] reduced MTU by MPPE_PAD. */
+			new_skb_size += MPPE_PAD;
+			compressor_skb_size += MPPE_PAD;
+		}
+		new_skb = alloc_skb(new_skb_size, GFP_ATOMIC);
 		if (new_skb == 0) {
 			printk(KERN_ERR "PPP: no memory (comp pkt)\n");
 			goto drop;
@@ -1019,15 +1026,27 @@
 		/* compressor still expects A/C bytes in hdr */
 		len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
 					   new_skb->data, skb->len + 2,
-					   ppp->dev->mtu + PPP_HDRLEN);
+					   compressor_skb_size);
 		if (len > 0 && (ppp->flags & SC_CCP_UP)) {
 			kfree_skb(skb);
 			skb = new_skb;
 			skb_put(skb, len);
 			skb_pull(skb, 2);	/* pull off A/C bytes */
-		} else {
+		} else if (len == 0) {
 			/* didn't compress, or CCP not up yet */
 			kfree_skb(new_skb);
+		} else {
+			/*
+			 * (len < 0)
+			 * MPPE requires that we do not send unencrypted
+			 * frames.  The compressor will return -1 if we
+			 * should drop the frame.  We cannot simply test
+			 * the compress_proto because MPPE and MPPC share
+			 * the same number.
+			 */
+			printk(KERN_ERR "ppp: compressor dropped pkt\n");
+			kfree_skb(new_skb);
+			goto drop;
 		}
 	}
 
@@ -1515,7 +1534,7 @@
 	int len;
 
 	if (proto == PPP_COMP) {
-		ns = dev_alloc_skb(ppp->mru + PPP_HDRLEN);
+		ns = dev_alloc_skb(ppp->mru + 128 + PPP_HDRLEN);
 		if (ns == 0) {
 			printk(KERN_ERR "ppp_decompress_frame: no memory\n");
 			goto err;