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net: mctp: fix device leak on probe failure

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Driver core holds a reference to the USB interface and its parent USB
device while the interface is bound to a driver and there is no need to
take additional references unless the structures are needed after
disconnect.

This driver takes a reference to the USB device during probe but does
not to release it on probe failures.

Drop the redundant device reference to fix the leak, reduce cargo
culting, make it easier to spot drivers where an extra reference is
needed, and reduce the risk of further memory leaks.

Fixes: 0791c0327a ("net: mctp: Add MCTP USB transport driver")
Cc: stable@vger.kernel.org	# 6.15
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Jeremy Kerr <jk@codeconstruct.com.au>
Link: https://patch.msgid.link/20260305104549.16110-1-johan@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Johan Hovold
2026-03-06 15:38:21 -08:00
committed by Jakub Kicinski
parent 0e16181704
commit 224a0d284c
1 changed files with 1 additions and 2 deletions
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drivers/net/mctp/mctp-usb.c
+1 -2
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@@ -329,7 +329,7 @@ static int mctp_usb_probe(struct usb_interface *intf,
SET_NETDEV_DEV(netdev, &intf->dev);
dev = netdev_priv(netdev);
dev->netdev = netdev;
dev->usbdev = usb_get_dev(interface_to_usbdev(intf));
dev->usbdev = interface_to_usbdev(intf);
dev->intf = intf;
usb_set_intfdata(intf, dev);
@@ -365,7 +365,6 @@ static void mctp_usb_disconnect(struct usb_interface *intf)
mctp_unregister_netdev(dev->netdev);
usb_free_urb(dev->tx_urb);
usb_free_urb(dev->rx_urb);
usb_put_dev(dev->usbdev);
free_netdev(dev->netdev);
}