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Commit 82b3cc1a authored by Ben McKeegan's avatar Ben McKeegan Committed by David S. Miller
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ppp: fix BUG on non-linear SKB (multilink receive)



PPP does not correctly call pskb_may_pull() on all necessary receive paths
before reading the PPP protocol, thus causing PPP to report seemingly
random 'unsupported protocols' and eventually trigger BUG_ON(skb->len <
skb->data_len) in skb_pull_rcsum() when receiving multilink protocol in
non-linear skbs.

ppp_receive_nonmp_frame() does not call pskb_may_pull() before reading the
protocol number.  For the non-mp receive path this is not a problem, as
this check is done in ppp_receive_frame().  For the mp receive path,
ppp_mp_reconstruct() usually copies the data into a new linear skb.
However, in the case where the frame is made up of a single mp fragment,
the mp header is pulled and the existing skb used.  This skb was then
passed to ppp_receive_nonmp_frame() without checking if the encapsulated
protocol header could safely be read.

Signed-off-by: default avatarBen McKeegan <ben@netservers.co.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c0e1f68b
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