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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, kuba@kernel.org
Subject: [PATCH net 1/4] netfilter: nftables: fix incorrect increment of loop counter
Date: Fri, 18 Dec 2020 13:04:06 +0100	[thread overview]
Message-ID: <20201218120409.3659-2-pablo@netfilter.org> (raw)
In-Reply-To: <20201218120409.3659-1-pablo@netfilter.org>

From: Colin Ian King <colin.king@canonical.com>

The intention of the err_expr cleanup path is to iterate over the
allocated expr_array objects and free them, starting from i - 1 and
working down to the start of the array. Currently the loop counter
is being incremented instead of decremented and also the index i is
being used instead of k, repeatedly destroying the same expr_array
element.  Fix this by decrementing k and using k as the index into
expr_array.

Addresses-Coverity: ("Infinite loop")
Fixes: 8cfd9b0f8515 ("netfilter: nftables: generalize set expressions support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 8d5aa0ac45f4..4186b1e52d58 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5254,8 +5254,8 @@ static int nft_set_elem_expr_clone(const struct nft_ctx *ctx,
 	return 0;
 
 err_expr:
-	for (k = i - 1; k >= 0; k++)
-		nft_expr_destroy(ctx, expr_array[i]);
+	for (k = i - 1; k >= 0; k--)
+		nft_expr_destroy(ctx, expr_array[k]);
 
 	return -ENOMEM;
 }
-- 
2.20.1


  reply	other threads:[~2020-12-18 12:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-18 12:04 [PATCH net 0/4] Netfilter fixes for net Pablo Neira Ayuso
2020-12-18 12:04 ` Pablo Neira Ayuso [this message]
2020-12-19  2:20   ` [PATCH net 1/4] netfilter: nftables: fix incorrect increment of loop counter patchwork-bot+netdevbpf
2020-12-18 12:04 ` [PATCH net 2/4] netfilter: x_tables: Update remaining dereference to RCU Pablo Neira Ayuso
2020-12-18 12:04 ` [PATCH net 3/4] netfilter: ipset: fixes possible oops in mtype_resize Pablo Neira Ayuso
2020-12-18 12:04 ` [PATCH net 4/4] netfilter: ipset: fix shift-out-of-bounds in htable_bits() Pablo Neira Ayuso

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