linux-kernel - [PATCH] net/atm/mpc: Fix dereference NULL pointer in mpc_send

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Date:   Thu, 23 Feb 2023 14:54:46 +0800
From:   Li Qiong <liqiong@...china.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, Yu Zhe <yuzhe@...china.com>,
        Li Qiong <liqiong@...china.com>
Subject: [PATCH] net/atm/mpc: Fix dereference NULL pointer in mpc_send_packet()

The 'non_ip' statement need do 'mpc' pointer dereference,
so return '-ENODEV' if 'mpc' is NULL.

Signed-off-by: Li Qiong <liqiong@...china.com>
---
 net/atm/mpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index 033871e718a3..1cd6610b8a12 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -577,7 +577,7 @@ static netdev_tx_t mpc_send_packet(struct sk_buff *skb,
 	mpc = find_mpc_by_lec(dev); /* this should NEVER fail */
 	if (mpc == NULL) {
 		pr_info("(%s) no MPC found\n", dev->name);
-		goto non_ip;
+		return -ENODEV;
 	}
 
 	eth = (struct ethhdr *)skb->data;
-- 
2.11.0