From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 5 Jan 2014 15:32:05 +0000 (+0000)
Subject: netlink: Avoid crash with clientless netlink
X-Git-Tag: debian/0.3.1_beta1~20
X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/commitdiff_plain/55bc97e626e0f31e04b190528b25c6e026942610?hp=55bc97e626e0f31e04b190528b25c6e026942610

netlink: Avoid crash with clientless netlink

In some pathological configurations, it can happen that a packet is
received from the kernel by a netlink which has no clients (that is,
where netlink_inst_reg has not been called).

Don't crash when this happens; instead, print a log message including
the source and destination addresses.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
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