[Bug 271991] Crash on some network packets with fresh stable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271991

--- Comment #7 from Ivan Rozhuk <rozhuk.im@gmail.com> ---
(In reply to Mark Johnston from comment #5)

> I don't think m_pullup() is the right layer to handle unmapped mbufs.  It gets called very frequently

This is good place to make sure that it handles most all cases where unmapped
data can be accessed.
Code rely on m_pullup() to ensure that data will be available for read.


> The patch to m_pullup() assumes that "m" is mapped, which might not be the case.

May be some additional changes required for this patch :)


> e1000 should handle unmapped mbufs though.  Do you see "NOMAP" in the interface flags as reported by ifconfig?

Yes, I see NOMAP in ifconfig output.
Probably it not work or if_vlan required to be in chain to reproduce error.


> I think it wouldn't be too difficult to make bpf_filter() work with unmapped mbufs.

It will fix one error, there is many other netgraph configurations that may be
affected.
ng_checksum, ng_deflate(?), ng_patch, ng_tcpmss and possible others.

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