[Bug 253587] pf: page fault in pf_pull_hdr

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253587

--- Comment #2 from Kristof Provost <kp at freebsd.org> ---
Best theory I have so far is that we're getting an invalid mbuf (chain) from
the driver. That is, our initial mbuf contains valid header information, but
has m_len set to 0. When we try to m_copydata() we try to find the first mbuf
in the chain that contains byte 'off', which makes us run straight off the end
of the mbuf chain and panic.

That'd likely make it a driver issue rather than a pf problem.

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