[PATCH 4.4 071/188] net: ethernet: ezchip: fix UAF in nps_enet_remove

Greg Kroah-Hartman
2021-07-19T14:59:40Z

From: Pavel Skripkin <paskripkin@gmail.com>

[ Upstream commit e4b8700e07a86e8eab6916aa5c5ba99042c34089 ]

priv is netdev private data, but it is used
after free_netdev(). It can cause use-after-free when accessing priv
pointer. So, fix it by moving free_netdev() after netif_napi_del()
call.

Fixes: 0dd077093636 ("NET: Add ezchip ethernet driver")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/ezchip/nps_enet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c
index b1026689b78f..73d2bc349b2f 100644
--- a/drivers/net/ethernet/ezchip/nps_enet.c
+++ b/drivers/net/ethernet/ezchip/nps_enet.c
@@ -621,8 +621,8 @@ static s32 nps_enet_remove(struct platform_device *pdev)
struct nps_enet_priv *priv = netdev_priv(ndev);

unregister_netdev(ndev);
- free_netdev(ndev);
netif_napi_del(&priv->napi);
+ free_netdev(ndev);

return 0;
}
--
2.30.2