[PATCH AUTOSEL 6.1 12/26] usb: gadget: u_ether: Do not make UDC parent of the net device

Sasha Levin
2022-12-24T01:31:40Z

From: Sascha Hauer <s.hauer@pengutronix.de>

[ Upstream commit 321b59870f850a10dbb211ecd2bd87b41497ea6f ]

The UDC is not a suitable parent of the net device as the UDC can
change or vanish during the lifecycle of the ethernet gadget. This
can be illustrated with the following:

mkdir -p /sys/kernel/config/usb_gadget/mygadget
cd /sys/kernel/config/usb_gadget/mygadget
mkdir -p configs/c.1/strings/0x409
echo "C1:Composite Device" > configs/c.1/strings/0x409/configuration
mkdir -p functions/ecm.usb0
ln -s functions/ecm.usb0 configs/c.1/
echo "dummy_udc.0" > UDC
rmmod dummy_hcd

The 'rmmod' removes the UDC from the just created gadget, leaving
the still existing net device with a no longer existing parent.

Accessing the ethernet device with commands like:

ip --details link show usb0

will result in a KASAN splat:

==================================================================
BUG: KASAN: use-after-free in if_nlmsg_size+0x3e8/0x528
Read of size 4 at addr c5c84754 by task ip/357

CPU: 3 PID: 357 Comm: ip Not tainted 6.1.0-rc3-00013-gd14953726b24-dirty #324
Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
unwind_backtrace from show_stack+0x10/0x14
show_stack from dump_stack_lvl+0x58/0x70
dump_stack_lvl from print_report+0x134/0x4d4
print_report from kasan_report+0x78/0x10c
kasan_report from if_nlmsg_size+0x3e8/0x528
if_nlmsg_size from rtnl_getlink+0x2b4/0x4d0
rtnl_getlink from rtnetlink_rcv_msg+0x1f4/0x674
rtnetlink_rcv_msg from netlink_rcv_skb+0xb4/0x1f8
netlink_rcv_skb from netlink_unicast+0x294/0x478
netlink_unicast from netlink_sendmsg+0x328/0x640
netlink_sendmsg from ____sys_sendmsg+0x2a4/0x3b4
____sys_sendmsg from ___sys_sendmsg+0xc8/0x12c
___sys_sendmsg from sys_sendmsg+0xa0/0x120
sys_sendmsg from ret_fast_syscall+0x0/0x1c

Solve this by not setting the parent of the ethernet device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20221104131031.850850-2-s.hauer@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/gadget/function/u_ether.c | 4 ----
1 file changed, 4 deletions(-)

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index e06022873df1..8f12f3f8f6ee 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -798,7 +798,6 @@ struct eth_dev *gether_setup_name(struct usb_gadget *g,
net->max_mtu = GETHER_MAX_MTU_SIZE;

dev->gadget = g;
- SET_NETDEV_DEV(net, &g->dev);
SET_NETDEV_DEVTYPE(net, &gadget_type);

status = register_netdev(net);
@@ -873,8 +872,6 @@ int gether_register_netdev(struct net_device *net)
struct usb_gadget *g;
int status;

- if (!net->dev.parent)
- return -EINVAL;
dev = netdev_priv(net);
g = dev->gadget;

@@ -905,7 +902,6 @@ void gether_set_gadget(struct net_device *net, struct usb_gadget *g)

dev = netdev_priv(net);
dev->gadget = g;
- SET_NETDEV_DEV(net, &g->dev);
}
EXPORT_SYMBOL_GPL(gether_set_gadget);

--
2.35.1