netdev - [PATCH net 8/8] net: atlantic: fix out of range usage of active

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Date:   Fri, 14 Feb 2020 18:44:58 +0300
From:   Igor Russkikh <irusskikh@...vell.com>
To:     <netdev@...r.kernel.org>
CC:     <dbogdanov@...vell.com>, <pbelous@...vell.com>,
        <ndanilov@...vell.com>, <davem@...emloft.net>
Subject: [PATCH net 8/8] net: atlantic: fix out of range usage of active_vlans array

From: Dmitry Bogdanov <dbogdanov@...vell.com>

fix static checker warning:
 drivers/net/ethernet/aquantia/atlantic/aq_filters.c:166 aq_check_approve_fvlan()
 error: passing untrusted data to 'test_bit()'

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Fixes: 7975d2aff5af: ("net: aquantia: add support of rx-vlan-filter offload")
Signed-off-by: Dmitry Bogdanov <dbogdanov@...vell.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_filters.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_filters.c b/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
index 6102251bb909..03ff92bc4a7f 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
@@ -163,7 +163,7 @@ aq_check_approve_fvlan(struct aq_nic_s *aq_nic,
 	}
 
 	if ((aq_nic->ndev->features & NETIF_F_HW_VLAN_CTAG_FILTER) &&
-	    (!test_bit(be16_to_cpu(fsp->h_ext.vlan_tci),
+	    (!test_bit(be16_to_cpu(fsp->h_ext.vlan_tci) & VLAN_VID_MASK,
 		       aq_nic->active_vlans))) {
 		netdev_err(aq_nic->ndev,
 			   "ethtool: unknown vlan-id specified");
-- 
2.17.1