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

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[ Upstream commit 4640177049549de1a43e9bc49265f0cdfce08cfd ]

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

Fixes: 542ae60af24f ("net: hisilicon: Add Fast Ethernet MAC driver")
Signed-off-by: Liu Jian <liujian56@huawei.com>
Link: https://lore.kernel.org/r/20221203094240.1240211-1-liujian56@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Liu Jian 2022-12-03 17:42:39 +08:00 committed by Greg Kroah-Hartman
parent 6b37f0dc06
commit 3501da8eb6
1 changed files with 1 additions and 1 deletions

2
drivers/net/ethernet/hisilicon/hisi_femac.c

@ -295,7 +295,7 @@ static int hisi_femac_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 = (pos + 1) % rxq->num;
if (rx_pkts_num >= limit)