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netfilter: nft_set_rbtree: .deactivate fails if element has expired

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commit d111692a59c1470ae530cbb39bcf0346c950ecc7 upstream.

This allows to remove an expired element which is not possible in other
existing set backends, this is more noticeable if gc-interval is high so
expired elements remain in the tree. On-demand gc also does not help in
this case, because this is delete element path. Return NULL if element
has expired.

Fixes: 8d8540c4f5e0 ("netfilter: nft_set_rbtree: add timeout support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2023-10-17 12:28:27 +02:00 • committed by Ksawlii
parent e7627cae4b
commit 6ec5dda291
1 changed files with 2 additions and 0 deletions
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2
net/netfilter/nft_set_rbtree.c
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@ -570,6 +570,8 @@ static void *nft_rbtree_deactivate(const struct net *net,
nft_rbtree_interval_end(this)) {
parent = parent->rb_right;
continue;
} else if (nft_set_elem_expired(&rbe->ext)) {
break;
} else if (!nft_set_elem_active(&rbe->ext, genmask)) {
parent = parent->rb_left;
continue;