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most: usb: fix double free on late probe failure

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The MOST subsystem has a non-standard registration function which frees
the interface on registration failures and on deregistration.

This unsurprisingly leads to bugs in the MOST drivers, and a couple of
recent changes turned a reference underflow and use-after-free in the
USB driver into several double free and a use-after-free on late probe
failures.

Fixes: 723de0f917 ("staging: most: remove device from interface structure")
Fixes: 4b12709026 ("most: usb: Fix use-after-free in hdm_disconnect")
Fixes: a8cc9e5fcb ("most: usb: hdm_probe: Fix calling put_device() before device initialization")
Cc: stable@vger.kernel.org
Cc: Christian Gromm <christian.gromm@microchip.com>
Cc: Victoria Votokina <Victoria.Votokina@kaspersky.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251029093029.28922-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
2025-10-29 10:30:29 +01:00
committed by Greg Kroah-Hartman
parent 96cf850093
commit baadf2a5c2
1 changed files with 5 additions and 9 deletions
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14
drivers/most/most_usb.c
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@@ -1058,7 +1058,7 @@ hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
ret = most_register_interface(&mdev->iface);
if (ret)
goto err_free_busy_urbs;
return ret;
mutex_lock(&mdev->io_mutex);
if (le16_to_cpu(usb_dev->descriptor.idProduct) == USB_DEV_ID_OS81118 ||
@@ -1068,8 +1068,7 @@ hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
if (!mdev->dci) {
mutex_unlock(&mdev->io_mutex);
most_deregister_interface(&mdev->iface);
ret = -ENOMEM;
goto err_free_busy_urbs;
return -ENOMEM;
}
mdev->dci->dev.init_name = "dci";
@@ -1078,18 +1077,15 @@ hdm_probe(struct usb_interface *interface, const struct usb_device_id *id)
mdev->dci->dev.release = release_dci;
if (device_register(&mdev->dci->dev)) {
mutex_unlock(&mdev->io_mutex);
put_device(&mdev->dci->dev);
most_deregister_interface(&mdev->iface);
ret = -ENOMEM;
goto err_free_dci;
return -ENOMEM;
}
mdev->dci->usb_device = mdev->usb_device;
}
mutex_unlock(&mdev->io_mutex);
return 0;
err_free_dci:
put_device(&mdev->dci->dev);
err_free_busy_urbs:
kfree(mdev->busy_urbs);
err_free_ep_address:
kfree(mdev->ep_address);
err_free_cap: