[ Upstream commit 3a39a12ad364a9acd1038ba8da67cd8430f30de4 ]
This patch is trying to fix the issue due to:
[27237.844750] BUG: KASAN: use-after-free in
hns_nic_net_xmit_hw+0x708/0xa18[hns_enet_drv]
After hnae_queue_xmit() in hns_nic_net_xmit_hw(), can be
interrupted by interruptions, and than call hns_nic_tx_poll_one()
to handle the new packets, and free the skb. So, when turn back to
hns_nic_net_xmit_hw(), calling skb->len will cause use-after-free.
This patch update tx ring statistics in hns_nic_tx_poll_one() to
fix the bug.
Signed-off-by: Liubin Shu <shuliu...@huawei.com>
Signed-off-by: Zhen Lei <thunder.leiz...@huawei.com>
Signed-off-by: Yonglong Liu <liuyongl...@huawei.com>
Signed-off-by: Peng Li <lipeng...@huawei.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/net/ethernet/hisilicon/hns/hns_enet.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index d30c28fba249..15739eae3da1 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -376,8 +376,6 @@ netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
wmb(); /* commit all data before submit */
assert(skb->queue_mapping < priv->ae_handle->q_num);
hnae_queue_xmit(priv->ae_handle->qs[skb->queue_mapping], buf_num);
- ring->stats.tx_pkts++;
- ring->stats.tx_bytes += skb->len;
return NETDEV_TX_OK;
@@ -1099,6 +1097,9 @@ static int hns_nic_tx_poll_one(struct hns_nic_ring_data
*ring_data,
/* issue prefetch for next Tx descriptor */
prefetch(&ring->desc_cb[ring->next_to_clean]);
}
+ /* update tx ring statistics. */
+ ring->stats.tx_pkts += pkts;
+ ring->stats.tx_bytes += bytes;
NETIF_TX_UNLOCK(ring);
--
2.20.1
