From: Pavel Skripkin Date: Fri, 18 Jun 2021 14:57:31 +0000 (+0300) Subject: net: ethernet: aeroflex: fix UAF in greth_of_remove X-Git-Tag: v4.4.276~120 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17771fd4ecd648a3570f871d27b47e764b1f8e18;p=thirdparty%2Fkernel%2Fstable.git net: ethernet: aeroflex: fix UAF in greth_of_remove [ Upstream commit e3a5de6d81d8b2199935c7eb3f7d17a50a7075b7 ] static int greth_of_remove(struct platform_device *of_dev) { ... struct greth_private *greth = netdev_priv(ndev); ... unregister_netdev(ndev); free_netdev(ndev); of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0])); ... } greth is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing greth pointer. So, fix it by moving free_netdev() after of_iounmap() call. Fixes: d4c41139df6e ("net: Add Aeroflex Gaisler 10/100/1G Ethernet MAC driver") Signed-off-by: Pavel Skripkin Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c index 20bf55dbd76f0..e3ca8abb14f43 100644 --- a/drivers/net/ethernet/aeroflex/greth.c +++ b/drivers/net/ethernet/aeroflex/greth.c @@ -1579,10 +1579,11 @@ static int greth_of_remove(struct platform_device *of_dev) mdiobus_unregister(greth->mdio); unregister_netdev(ndev); - free_netdev(ndev); of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0])); + free_netdev(ndev); + return 0; }