diff -Naur linux-2.4.10/drivers/net/ppp_generic.c linux-2.4.10-new/drivers/net/ppp_generic.c
--- linux-2.4.10/drivers/net/ppp_generic.c Sun Sep  9 19:45:43 2001
+++ linux-2.4.10-new/drivers/net/ppp_generic.c Tue Nov 13 21:48:29 2001
@@ -1470,6 +1470,23 @@
   /* check if the packet passes the pass and active filters */
   /* the filter instructions are constructed assuming
      a four-byte PPP header on each packet */
+         /* make sure we have room for the following skb_push... */
+         if (skb_headroom(skb) < PPP_HDRLEN) {
+      struct sk_buff *ns;
+      
+      ns = alloc_skb(skb->len + PPP_HDRLEN*2,GFP_ATOMIC);
+      if (ns == 0) {
+   printk(KERN_DEBUG "PPP: inbound skb not resizeable.\n");
+   kfree_skb(skb);
+   return;
+      }
+      skb_reserve(ns, PPP_HDRLEN*2);
+      memcpy(skb_put(ns, skb->len), skb->data, skb->len);
+      kfree_skb(skb);
+      skb = ns;
+      if (ppp->debug & 1)
+   printk(KERN_DEBUG "PPP: inbound skb resized.\n");
+  }
   *skb_push(skb, 2) = 0;
   if (ppp->pass_filter.filter
       && sk_run_filter(skb, ppp->pass_filter.filter,