netdev - [PATCH nf 1/2] nft_set_pipapo: Fix bucket load in AVX2 lookup routine for six 8-bit groups

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Date:   Sat, 27 Nov 2021 11:33:37 +0100
From:   Stefano Brivio <sbrivio@...hat.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Nikita Yushchenko <nikita.yushchenko@...tuozzo.com>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH nf 1/2] nft_set_pipapo: Fix bucket load in AVX2 lookup routine for six 8-bit groups

The sixth byte of packet data has to be looked up in the sixth group,
not in the seventh one, even if we load the bucket data into ymm6
(and not ymm5, for convenience of tracking stalls).

Without this fix, matching on a MAC address as first field of a set,
if 8-bit groups are selected (due to a small set size) would fail,
that is, the given MAC address would never match.

Reported-by: Nikita Yushchenko <nikita.yushchenko@...tuozzo.com>
Cc: <stable@...r.kernel.org> # 5.6.x
Fixes: 7400b063969b ("nft_set_pipapo: Introduce AVX2-based lookup implementation")
Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
---
 net/netfilter/nft_set_pipapo_avx2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nft_set_pipapo_avx2.c b/net/netfilter/nft_set_pipapo_avx2.c
index e517663e0cd1..6f4116e72958 100644
--- a/net/netfilter/nft_set_pipapo_avx2.c
+++ b/net/netfilter/nft_set_pipapo_avx2.c
@@ -886,7 +886,7 @@ static int nft_pipapo_avx2_lookup_8b_6(unsigned long *map, unsigned long *fill,
 			NFT_PIPAPO_AVX2_BUCKET_LOAD8(4,  lt, 4, pkt[4], bsize);
 
 			NFT_PIPAPO_AVX2_AND(5, 0, 1);
-			NFT_PIPAPO_AVX2_BUCKET_LOAD8(6,  lt, 6, pkt[5], bsize);
+			NFT_PIPAPO_AVX2_BUCKET_LOAD8(6,  lt, 5, pkt[5], bsize);
 			NFT_PIPAPO_AVX2_AND(7, 2, 3);
 
 			/* Stall */
-- 
2.30.2