[Bug 253587] pf: page fault in pf_pull_hdr

[bugzilla-noreply at freebsd.org]

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

Kristof Provost <kp at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kp at freebsd.org

--- Comment #1 from Kristof Provost <kp at freebsd.org> ---
I am very confused by this panic.

I initially thought that pf didn't account for mbufs with external storage, but
the network stack should already have fixed that for us.
The mbuf has m_len == 0, which shouldn't be possible. The network stack would
have done m_pullup(), and has in any event has done mtod(m, struct ip6_hdr)
without issue.
Additionally, the pf_test6() function has also done this without issue.

It's also not clear how pf_pull_hdr() can get a valid m pointer and yet call
m_copydata() with a NULL mbuf pointer.

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