linux-kernel - [PATCH 4.19 242/639] netfilter: nft_set_hash: bogus element self comparison from deactivation path

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Message-Id: <20200124093117.120261624@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:26:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 242/639] netfilter: nft_set_hash: bogus element self comparison from deactivation path

From: Pablo Neira Ayuso <pablo@...filter.org>

[ Upstream commit a01cbae57ec29b161d42ee1caa4ffffda5d519c2 ]

Use the element from the loop iteration, not the same element we want to
deactivate otherwise this branch always evaluates true.

Fixes: 6c03ae210ce3 ("netfilter: nft_set_hash: add non-resizable hashtable implementation")
Reported-by: Florian Westphal <fw@...len.de>
Tested-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/netfilter/nft_set_hash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c
index 8dde4bfe8b8a4..05118e03c3e48 100644
--- a/net/netfilter/nft_set_hash.c
+++ b/net/netfilter/nft_set_hash.c
@@ -555,7 +555,7 @@ static void *nft_hash_deactivate(const struct net *net,
 
 	hash = nft_jhash(set, priv, &this->ext);
 	hlist_for_each_entry(he, &priv->table[hash], node) {
-		if (!memcmp(nft_set_ext_key(&this->ext), &elem->key.val,
+		if (!memcmp(nft_set_ext_key(&he->ext), &elem->key.val,
 			    set->klen) &&
 		    nft_set_elem_active(&he->ext, genmask)) {
 			nft_set_elem_change_active(net, set, &he->ext);
-- 
2.20.1