diff mbox series

[5.13,127/156] net: qcom/emac: fix UAF in emac_remove

Message ID 20210722155632.467108686@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman July 22, 2021, 4:31 p.m. UTC 
From: Pavel Skripkin <paskripkin@gmail.com>

commit ad297cd2db8953e2202970e9504cab247b6c7cb4 upstream.

adpt is netdev private data and it cannot be
used after free_netdev() call. Using adpt after free_netdev()
can cause UAF bug. Fix it by moving free_netdev() at the end of the
function.

Fixes: 54e19bc74f33 ("net: qcom/emac: do not use devm on internal phy pdev")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/qualcomm/emac/emac.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -735,12 +735,13 @@  static int emac_remove(struct platform_d
 
 	put_device(&adpt->phydev->mdio.dev);
 	mdiobus_unregister(adpt->mii_bus);
-	free_netdev(netdev);
 
 	if (adpt->phy.digital)
 		iounmap(adpt->phy.digital);
 	iounmap(adpt->phy.base);
 
+	free_netdev(netdev);
+
 	return 0;
 }