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Commit f4c85bb2 authored by Devi Sandeep Endluri V V's avatar Devi Sandeep Endluri V V Committed by Gerrit - the friendly Code Review server
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l2tp_ppp: Fix Protocol in PPP Frame 



protocol-field-compression is supported for PPP Frames. Therefore,
Protocol field has to be fixed before sending it to ppp driver.
Failing to do so, kernel retrieves 2 bytes and incorrectly
assumes that the protocol is incorrect and unsupported.

Check if the protocol is compressed, and fix it by pushing one
additional byte to skb.

CRs-Fixed: 2393404
Change-Id: Ia31806a29e038b5b7d8829498bf42491b94553df
Signed-off-by: default avatarDevi Sandeep Endluri V V <dendluri@codeaurora.org>
parent b8e4919b

net/l2tp/l2tp_ppp.c

+6 −0
Original line number Diff line number Diff line
@@ -180,6 +180,12 @@ static int pppol2tp_recv_payload_hook(struct sk_buff *skb) 
	if ((skb->data[0] == PPP_ALLSTATIONS) && (skb->data[1] == PPP_UI))

		skb_pull(skb, 2);



	if (skb->len >= 1 && skb->data[0] & 1)

		*(u8 *)skb_push(skb, 1) = 0;



	if (skb->len < 2)

		return 1;



	return 0;

}