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[net,3/4] netfilter: nft_set_rbtree: .deactivate fails if element has expired

Message ID 20231018125605.27299-4-fw@strlen.de
State Handled Elsewhere, archived
Headers show
Series [net,1/4] netfilter: nf_tables: audit log object reset once per table | expand

Commit Message

Florian Westphal Oct. 18, 2023, 12:55 p.m. UTC 
From: Pablo Neira Ayuso <pablo@netfilter.org>

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>
---
 net/netfilter/nft_set_rbtree.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index 2660ceab3759..e34662f4a71e 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -568,6 +568,8 @@  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;