ppp_generic: pull 2 bytes so that PPP_PROTO(skb) is valid

In ppp_input(), PPP_PROTO(skb) may refer to invalid data in the skb.

If this happens and (proto >= 0xc000 || proto == PPP_CCPFRAG) then
the packet is passed directly to pppd.

This occurs frequently when using PPPoE with an interface MTU
greater than 1500 because the skb is more likely to be non-linear.

The next 2 bytes need to be pulled in ppp_input(). The pull of 2
bytes in ppp_receive_frame() has been removed as it is no longer
required.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index 6e281bc..75e8903 100644 (file)
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -1567,13 +1567,22 @@ ppp_input(struct ppp_channel *chan, struct sk_buff *skb)
        struct channel *pch = chan->ppp;
        int proto;
 
-       if (!pch || skb->len == 0) {
+       if (!pch) {
                kfree_skb(skb);
                return;
        }
 
-       proto = PPP_PROTO(skb);
        read_lock_bh(&pch->upl);
+       if (!pskb_may_pull(skb, 2)) {
+               kfree_skb(skb);
+               if (pch->ppp) {
+                       ++pch->ppp->dev->stats.rx_length_errors;
+                       ppp_receive_error(pch->ppp);
+               }
+               goto done;
+       }
+
+       proto = PPP_PROTO(skb);
        if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {
                /* put it on the channel queue */
                skb_queue_tail(&pch->file.rq, skb);
@@ -1585,6 +1594,8 @@ ppp_input(struct ppp_channel *chan, struct sk_buff *skb)
        } else {
                ppp_do_recv(pch->ppp, skb, pch);
        }
+
+done:
        read_unlock_bh(&pch->upl);
 }
 
@@ -1617,7 +1628,8 @@ ppp_input_error(struct ppp_channel *chan, int code)
 static void
 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 {
-       if (pskb_may_pull(skb, 2)) {
+       /* note: a 0-length skb is used as an error indication */
+       if (skb->len > 0) {
 #ifdef CONFIG_PPP_MULTILINK
                /* XXX do channel-level decompression here */
                if (PPP_PROTO(skb) == PPP_MP)
@@ -1625,15 +1637,10 @@ ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
                else
 #endif /* CONFIG_PPP_MULTILINK */
                        ppp_receive_nonmp_frame(ppp, skb);
-               return;
+       } else {
+               kfree_skb(skb);
+               ppp_receive_error(ppp);
        }
-
-       if (skb->len > 0)
-               /* note: a 0-length skb is used as an error indication */
-               ++ppp->dev->stats.rx_length_errors;
-
-       kfree_skb(skb);
-       ppp_receive_error(ppp);
 }
 
 static void