Hi,

using pppoatm from Mitchell Blank jr resulted in a BUG "skput:under: ..." when
used w/ vc-encapsulation.  The problem is (at least w/ the iphase driver) that
the skb's headroom is 0 (since the vc-encaps. is nothing but the PPP frame) and
ppp_receive_nonmp_frame unconditionally calls skb_push -> BUG(skput:under: ...")
in the CONFIG_PPP_FILTER section.

I've attached a patch, checking for headroom first, and - if necessary -
reallocating a larger buffer for the skb_push.

Please check and apply - or find a better fix!

Thanks,

Immanuel

--
Till Immanuel Patzschke                 mailto: tip@internetwork-ag.de
interNetwork AG                         Phone:  +49-(0)611-1731-121
Bierstadter Str. 7                      Fax:    +49-(0)611-1731-31
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