net: ethernet: ezchip: fix UAF in nps_enet_remove

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>

diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c
index e3954d8..20d2c2b 100644 (file)
--- a/drivers/net/ethernet/ezchip/nps_enet.c
+++ b/drivers/net/ethernet/ezchip/nps_enet.c
@@ -642,8 +642,8 @@ 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;
 }