** Tags added: cscc
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https://bugs.launchpad.net/bugs/1793753
Title:
kernel panic - null pointer dereference on ipset operations
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Bug description:
== SRU Justification ==
A regression was introduced in Xenial, even prior to v4.4 Final. I did
not test prior to this kernel once I found the bug was fixed in
mainline. The bug reporter experienced crashes on machines running
iptables using ipsets. He could get a trace from the console on one of
them which is attached to the bug report.
On these machines, some ipset commands are automatically run to update the
sets, and/or to dump them (ipset restore, swap, delete ... / ipset save).
I was able to reproduce this bug as was cking. This bug was found to be
fixed by mainline commits 596cf3fe5854 and e5173418ac59.
== Fixes ==
596cf3fe5854 ("netfilter: ipset: fix race condition in ipset save, swap and
delete")
e5173418ac59 ("netfilter: ipset: Fix race between dump and swap")
== Regression Potential ==
Low. This fixes a regression and is limited to netfilter.
== Test Case ==
A test kernel was built with these patches and tested by myself and cking.
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