netdev - [PATCH 1/2] net: dsa: tag_ksz: linearize SKB before adding DSA tag

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Message-Id: <20210714191723.31294-2-LinoSanfilippo@gmx.de>
Date:   Wed, 14 Jul 2021 21:17:22 +0200
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     woojung.huh@...rochip.com
Cc:     UNGLinuxDriver@...rochip.com, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Lino Sanfilippo <LinoSanfilippo@....de>
Subject: [PATCH 1/2] net: dsa: tag_ksz: linearize SKB before adding DSA tag

In ksz9477_xmit() skb_put() is used to add the DSA tag to the passed SKB.
However skb_put() must only be called for linear SKBs which may not be the
case if the DSA slave device inherited NETIF_F_SG from the master device.
So make sure the SKB is always linearized.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
---
 net/dsa/tag_ksz.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 53565f48934c..364f509d7cd7 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -53,6 +53,9 @@ static struct sk_buff *ksz8795_xmit(struct sk_buff *skb, struct net_device *dev)
 	u8 *tag;
 	u8 *addr;
 
+	if (skb_linearize(skb))
+		return NULL;
+
 	/* Tag encoding */
 	tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
 	addr = skb_mac_header(skb);
@@ -114,6 +117,9 @@ static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
 	u8 *addr;
 	u16 val;
 
+	if (skb_linearize(skb))
+		return NULL;
+
 	/* Tag encoding */
 	tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN);
 	addr = skb_mac_header(skb);
@@ -164,6 +170,9 @@ static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
 	u8 *addr;
 	u8 *tag;
 
+	if (skb_linearize(skb))
+		return NULL;
+
 	/* Tag encoding */
 	tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
 	addr = skb_mac_header(skb);
-- 
2.32.0