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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Pablo Neira Ayuso <pablo@netfilter.org>,
	Florian Westphal <fw@strlen.de>, Sasha Levin <sashal@kernel.org>,
	netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 226/671] netfilter: nft_set_hash: bogus element self comparison from deactivation path
Date: Thu, 16 Jan 2020 11:52:15 -0500
Message-ID: <20200116165940.10720-109-sashal@kernel.org> (raw)
In-Reply-To: <20200116165940.10720-1-sashal@kernel.org>

From: Pablo Neira Ayuso <pablo@netfilter.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@strlen.de>
Tested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 8dde4bfe8b8a..05118e03c3e4 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


      parent reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116165940.10720-1-sashal@kernel.org>
2020-01-16 16:52 ` [PATCH AUTOSEL 4.19 225/671] netfilter: nft_set_hash: fix lookups with fixed size hash on big endian Sasha Levin
2020-01-16 16:52 ` Sasha Levin [this message]

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