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net: usb: ipheth: fix carrier_work UAF on disconnect

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ipheth_sndbulk_callback() re-arms the carrier-check work on any
non-zero URB status:

	else
		schedule_delayed_work(&dev->carrier_work, 0);

Nothing ties that to the interface being up, so the work can be armed
again after ipheth_close() has already drained it, and stay armed
until the netdev whose private area embeds it is freed.

On unplug with a TX URB in flight, ipheth_disconnect() drains the work
through unregister_netdev() -> ipheth_close() ->
cancel_delayed_work_sync() and only then calls ipheth_kill_urbs().
usb_kill_urb() completes the in-flight TX URB with -ENOENT, so
ipheth_sndbulk_callback() runs after the drain and re-arms
carrier_work.

The same completion also re-arms the work if the interface is only
brought down while a TX URB is in flight, and
ipheth_carrier_check_work() then keeps re-queueing itself once a
second. unregister_netdev() does not call ipheth_close() for an
already-down interface, so nothing drains it on the later unplug
either.

In both cases free_netdev() frees the netdev while carrier_work is
still pending, and ipheth_carrier_check_work() dereferences freed
memory.

Tie the work to the interface state instead of chasing the completion:
disable it in ipheth_close() and enable it in ipheth_open(), so a
schedule_delayed_work() from the URB completion is a no-op whenever
the interface is not up. disable_delayed_work_sync() also waits for a
running instance, so it fully replaces the cancel_delayed_work_sync()
it takes the place of. The work starts out disabled in ipheth_probe()
so the enable/disable counts balance from the first open.

Reproduced under KASAN on linux-next (next-20260731) with dummy_hcd and
raw-gadget standing in for the device, driving the second path above (the
interface is already down, so unregister_netdev() does not call
ipheth_close()): 15 of 15 unpatched boots report a slab-use-after-free in
__run_timers(), freed by ipheth_disconnect() and re-armed from
ipheth_sndbulk_callback() via queue_delayed_work_on(). The
same trigger on a kernel differing only by this patch reports 0 of 15,
and the carrier check still functions across open/close cycles.

The reproducer needs an attached USB device that stops draining bulk OUT,
plus a link down and unplug, driven as root. It is not a privilege
boundary crossing and no exploit primitive was developed.

Found by 0sec (https://0sec.ai).

Fixes: bb1b40c7cb ("usbnet: ipheth: prevent TX queue timeouts when device not ready")
Cc: stable@vger.kernel.org
Signed-off-by: Doruk Tan Ozturk <doruk@0sec.ai>
Link: https://patch.msgid.link/20260802120602.42595-1-doruk@0sec.ai
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Doruk Tan Ozturk
2026-08-02 14:06:02 +02:00
committed by Jakub Kicinski
parent 68bf02b6b4
commit fde39b8a52
1 changed files with 10 additions and 1 deletions
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11
drivers/net/usb/ipheth.c
View File

@@ -490,6 +490,7 @@ static int ipheth_open(struct net_device *net)
if (retval)
return retval;
enable_delayed_work(&dev->carrier_work);
schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
return retval;
}
@@ -499,7 +500,11 @@ static int ipheth_close(struct net_device *net)
struct ipheth_device *dev = netdev_priv(net);
netif_stop_queue(net);
cancel_delayed_work_sync(&dev->carrier_work);
/* A TX URB can still complete with an error after this point and
* try to re-arm the carrier work. Disable it instead of cancelling
* it, so that such a schedule_delayed_work() is a no-op.
*/
disable_delayed_work_sync(&dev->carrier_work);
return 0;
}
@@ -629,6 +634,10 @@ static int ipheth_probe(struct usb_interface *intf,
}
INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
/* Armed only between ipheth_open() and ipheth_close(). Start out
* disabled so the enable/disable counts balance from the first open.
*/
disable_delayed_work(&dev->carrier_work);
retval = ipheth_alloc_urbs(dev);
if (retval) {