linux-kernel - [PATCH 5.4 192/355] net: dsa: rtl8366rb: Fix off-by-one bug

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Date:   Mon, 15 Nov 2021 18:01:56 +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, Mauri Sandberg <sandberg@...lfence.com>,
        DENG Qingfang <dqfext@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Vladimir Oltean <olteanv@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 192/355] net: dsa: rtl8366rb: Fix off-by-one bug

From: Linus Walleij <linus.walleij@...aro.org>

[ Upstream commit 5f5f12f5d4b108399130bb5c11f07765851d9cdb ]

The max VLAN number with non-4K VLAN activated is 15, and the
range is 0..15. Not 16.

The impact should be low since we by default have 4K VLAN and
thus have 4095 VLANs to play with in this switch. There will
not be a problem unless the code is rewritten to only use
16 VLANs.

Fixes: d8652956cf37 ("net: dsa: realtek-smi: Add Realtek SMI driver")
Cc: Mauri Sandberg <sandberg@...lfence.com>
Cc: DENG Qingfang <dqfext@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>
Reviewed-by: Alvin Šipraga <alsi@...g-olufsen.dk>
Reviewed-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/rtl8366rb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c
index 7f731bf369980..d047004360615 100644
--- a/drivers/net/dsa/rtl8366rb.c
+++ b/drivers/net/dsa/rtl8366rb.c
@@ -1264,7 +1264,7 @@ static int rtl8366rb_set_mc_index(struct realtek_smi *smi, int port, int index)
 
 static bool rtl8366rb_is_vlan_valid(struct realtek_smi *smi, unsigned int vlan)
 {
-	unsigned int max = RTL8366RB_NUM_VLANS;
+	unsigned int max = RTL8366RB_NUM_VLANS - 1;
 
 	if (smi->vlan4k_enabled)
 		max = RTL8366RB_NUM_VIDS - 1;
-- 
2.33.0