ppp: call skb_checksum_complete_unset in ppp_receive_frame

commit 3dfb05340ec6676e6fc71a9ae87bbbe66d3c2998 upstream.

Call checksum_complete_unset in PPP receive to discard checksum-complete
value. PPP does not pull checksum for headers and also modifies packet
as in VJ compression.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index a75a411b1c2734bf220364cc9fb271b520690e29..dbf56debb7e3e3977e47adf07f97a48d676b4d66 100644 (file)
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -1710,6 +1710,7 @@ ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
 {
        /* note: a 0-length skb is used as an error indication */
        if (skb->len > 0) {
+               skb_checksum_complete_unset(skb);
 #ifdef CONFIG_PPP_MULTILINK
                /* XXX do channel-level decompression here */
                if (PPP_PROTO(skb) == PPP_MP)