tree c6f34fff64f5040aaa3d62b2780e453141c20363
parent aea1d19594e68d3beaf5cc11e4b5f5b9059abdb7
author Pablo Neira Ayuso <pablo@netfilter.org> 1545956688 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1548189629 +0100

netfilter: nf_conncount: speculative garbage collection on empty lists

commit c80f10bc973af2ace6b1414724eeff61eaa71837 upstream.

Instead of removing a empty list node that might be reintroduced soon
thereafter, tentatively place the empty list node on the list passed to
tree_nodes_free(), then re-check if the list is empty again before erasing
it from the tree.

[ Florian: rebase on top of pending nf_conncount fixes ]

Fixes: 5c789e131cbb9 ("netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search")
Reviewed-by: Shawn Bohrer <sbohrer@cloudflare.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>