net: hisilicon: Fix potential use-after-free in hix5hd2_rx()

stable inclusion
from stable-v5.10.159
commit 93aaa4bb72e388f6a4887541fd3d18b84f1b5ddc
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NTXH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=93aaa4bb72e388f6a4887541fd3d18b84f1b5ddc

--------------------------------

[ Upstream commit 433c07a1 ]

The skb is delivered to napi_gro_receive() which may free it, after
calling this, dereferencing skb may trigger use-after-free.

Fixes: 57c5bc9a ("net: hisilicon: add hix5hd2 mac driver")
Signed-off-by: NLiu Jian <liujian56@huawei.com>
Link: https://lore.kernel.org/r/20221203094240.1240211-2-liujian56@huawei.comSigned-off-by: NPaolo Abeni <pabeni@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: Nsanglipeng <sanglipeng1@jd.com>

drivers/net/ethernet/hisilicon/hix5hd2_gmac.c

@@ -550,7 +550,7 @@ static int hix5hd2_rx(struct net_device *dev, int limit)
 		skb->protocol = eth_type_trans(skb, dev);
 		napi_gro_receive(&priv->napi, skb);
 		dev->stats.rx_packets++;
-		dev->stats.rx_bytes += skb->len;
+		dev->stats.rx_bytes += len;
 next:
 		pos = dma_ring_incr(pos, RX_DESC_NUM);
 	}