netdev - [PATCH net-next 01/12] macsec: replace custom checks on MACSEC_SA_ATTR_AN with NLA_POLICY

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Date:   Wed, 28 Sep 2022 18:17:14 +0200
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     netdev@...r.kernel.org
Cc:     Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net-next 01/12] macsec: replace custom checks on MACSEC_SA_ATTR_AN with NLA_POLICY_MAX

Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 drivers/net/macsec.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index c891b60937a7..061ed437daa5 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1544,9 +1544,6 @@ static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
 	if (IS_ERR(dev))
 		return ERR_CAST(dev);
 
-	if (*assoc_num >= MACSEC_NUM_AN)
-		return ERR_PTR(-EINVAL);
-
 	secy = &macsec_priv(dev)->secy;
 	tx_sc = &secy->tx_sc;
 
@@ -1607,8 +1604,6 @@ static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
 		return ERR_PTR(-EINVAL);
 
 	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
-	if (*assoc_num >= MACSEC_NUM_AN)
-		return ERR_PTR(-EINVAL);
 
 	rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
 	if (IS_ERR(rx_sc))
@@ -1635,7 +1630,7 @@ static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
 };
 
 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
-	[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
+	[MACSEC_SA_ATTR_AN] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1),
 	[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
 	[MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
 	[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
@@ -1700,8 +1695,6 @@ static bool validate_add_rxsa(struct nlattr **attrs)
 	    !attrs[MACSEC_SA_ATTR_KEYID])
 		return false;
 
-	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
-		return false;
 
 	if (attrs[MACSEC_SA_ATTR_PN] &&
 	    nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
@@ -1944,9 +1937,6 @@ static bool validate_add_txsa(struct nlattr **attrs)
 	    !attrs[MACSEC_SA_ATTR_KEYID])
 		return false;
 
-	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
-		return false;
-
 	if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
 		return false;
 
@@ -2298,9 +2288,6 @@ static bool validate_upd_sa(struct nlattr **attrs)
 	    attrs[MACSEC_SA_ATTR_SALT])
 		return false;
 
-	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
-		return false;
-
 	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
 		return false;
 
-- 
2.37.3