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net: qcom/emac: fix UAF in emac_remove

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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>
This commit is contained in:
Pavel Skripkin 2021-07-09 17:24:18 +03:00 committed by Greg Kroah-Hartman
parent 0cf46cbc55
commit 4d04a42b92
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/qualcomm/emac/emac.c
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@ -746,12 +746,13 @@ static int emac_remove(struct platform_device *pdev)
if (!has_acpi_companion(&pdev->dev))
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;
}