linux-kernel - [PATCH] net: dsa: qca8k: Add check for skb

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Date:   Mon, 10 Jul 2023 09:39:07 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     andrew@...n.ch, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, ansuelsmth@...il.com, rmk+kernel@...linux.org.uk
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] net: dsa: qca8k: Add check for skb_copy

Add check for the return value of skb_copy in order to avoid NULL pointer
dereference.

Fixes: 2cd548566384 ("net: dsa: qca8k: add support for phy read/write with mgmt Ethernet")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/net/dsa/qca/qca8k-8xxx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
index f7d7cfb2fd86..09b80644c11b 100644
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -588,6 +588,9 @@ qca8k_phy_eth_busy_wait(struct qca8k_mgmt_eth_data *mgmt_eth_data,
 	bool ack;
 	int ret;
 
+	if (!skb)
+		return -ENOMEM;
+
 	reinit_completion(&mgmt_eth_data->rw_done);
 
 	/* Increment seq_num and set it in the copy pkt */
-- 
2.25.1