netfilter: ctnetlink: fix refcnt leak in dying/unconfirmed list dumper

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'last' keeps track of the ct that had its refcnt bumped during previous
dump cycle.  Thus it must not be overwritten until end-of-function.

Another (unrelated, theoretical) issue: Don't attempt to bump refcnt of a conntrack
whose reference count is already 0.  Such conntrack is being destroyed
right now, its memory is freed once we release the percpu dying spinlock.

Fixes: b7779d06 ('netfilter: conntrack: spinlock per cpu to protect special lists.')
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Florian Westphal 2014-06-08 11:41:23 +02:00 • committed by Pablo Neira Ayuso

parent 266155b2de

commit cd5f336f17

1 changed files with 5 additions and 3 deletions

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net/netfilter/nf_conntrack_netlink.c

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