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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 6/6] netfilter: nft_set_rbtree: Add missing expired checks
Date: Thu, 14 May 2020 14:19:13 +0200	[thread overview]
Message-ID: <20200514121913.24519-7-pablo@netfilter.org> (raw)
In-Reply-To: <20200514121913.24519-1-pablo@netfilter.org>

From: Phil Sutter <phil@nwl.cc>

Expired intervals would still match and be dumped to user space until
garbage collection wiped them out. Make sure they stop matching and
disappear (from users' perspective) as soon as they expire.

Fixes: 8d8540c4f5e03 ("netfilter: nft_set_rbtree: add timeout support")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_set_rbtree.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c
index 3ffef454d469..62f416bc0579 100644
--- a/net/netfilter/nft_set_rbtree.c
+++ b/net/netfilter/nft_set_rbtree.c
@@ -79,6 +79,10 @@ static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set
 				parent = rcu_dereference_raw(parent->rb_left);
 				continue;
 			}
+
+			if (nft_set_elem_expired(&rbe->ext))
+				return false;
+
 			if (nft_rbtree_interval_end(rbe)) {
 				if (nft_set_is_anonymous(set))
 					return false;
@@ -94,6 +98,7 @@ static bool __nft_rbtree_lookup(const struct net *net, const struct nft_set *set
 
 	if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
 	    nft_set_elem_active(&interval->ext, genmask) &&
+	    !nft_set_elem_expired(&interval->ext) &&
 	    nft_rbtree_interval_start(interval)) {
 		*ext = &interval->ext;
 		return true;
@@ -154,6 +159,9 @@ static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
 				continue;
 			}
 
+			if (nft_set_elem_expired(&rbe->ext))
+				return false;
+
 			if (!nft_set_ext_exists(&rbe->ext, NFT_SET_EXT_FLAGS) ||
 			    (*nft_set_ext_flags(&rbe->ext) & NFT_SET_ELEM_INTERVAL_END) ==
 			    (flags & NFT_SET_ELEM_INTERVAL_END)) {
@@ -170,6 +178,7 @@ static bool __nft_rbtree_get(const struct net *net, const struct nft_set *set,
 
 	if (set->flags & NFT_SET_INTERVAL && interval != NULL &&
 	    nft_set_elem_active(&interval->ext, genmask) &&
+	    !nft_set_elem_expired(&interval->ext) &&
 	    ((!nft_rbtree_interval_end(interval) &&
 	      !(flags & NFT_SET_ELEM_INTERVAL_END)) ||
 	     (nft_rbtree_interval_end(interval) &&
@@ -418,6 +427,8 @@ static void nft_rbtree_walk(const struct nft_ctx *ctx,
 
 		if (iter->count < iter->skip)
 			goto cont;
+		if (nft_set_elem_expired(&rbe->ext))
+			goto cont;
 		if (!nft_set_elem_active(&rbe->ext, iter->genmask))
 			goto cont;
 
-- 
2.20.1


  parent reply	other threads:[~2020-05-14 12:19 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-14 12:19 [PATCH 0/6] Netfilter fixes for net Pablo Neira Ayuso
2020-05-14 12:19 ` [PATCH 1/6] netfilter: conntrack: avoid gcc-10 zero-length-bounds warning Pablo Neira Ayuso
2020-05-14 12:19 ` [PATCH 2/6] netfilter: flowtable: Add pending bit for offload work Pablo Neira Ayuso
2020-05-14 12:19 ` [PATCH 3/6] netfilter: flowtable: Remove WQ_MEM_RECLAIM from workqueue Pablo Neira Ayuso
2020-05-14 12:19 ` [PATCH 4/6] netfilter: conntrack: fix infinite loop on rmmod Pablo Neira Ayuso
2020-05-14 12:19 ` [PATCH 5/6] netfilter: flowtable: set NF_FLOW_TEARDOWN flag on entry expiration Pablo Neira Ayuso
2020-05-14 12:19 ` Pablo Neira Ayuso [this message]
2020-05-14 20:15 ` [PATCH 0/6] Netfilter fixes for net David Miller

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