From 36ead57443146e6b730ce1f48ca3e9b17e19a3d2 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Mon, 23 Feb 2026 13:10:30 +0100 Subject: [PATCH] can: usb: f81604: handle short interrupt urb messages properly commit 7299b1b39a255f6092ce4ec0b65f66e9d6a357af upstream. If an interrupt urb is received that is not the correct length, properly detect it and don't attempt to treat the data as valid. Cc: Ji-Ze Hong (Peter Hong) Cc: Marc Kleine-Budde Cc: Vincent Mailhol Cc: stable@kernel.org Assisted-by: gkh_clanker_2000 Signed-off-by: Greg Kroah-Hartman Link: https://patch.msgid.link/2026022331-opal-evaluator-a928@gregkh Fixes: 88da17436973 ("can: usb: f81604: add Fintek F81604 support") Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/usb/f81604.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/can/usb/f81604.c b/drivers/net/can/usb/f81604.c index 9e416cb642dc..e87e2674ac58 100644 --- a/drivers/net/can/usb/f81604.c +++ b/drivers/net/can/usb/f81604.c @@ -626,6 +626,12 @@ static void f81604_read_int_callback(struct urb *urb) netdev_info(netdev, "%s: Int URB aborted: %pe\n", __func__, ERR_PTR(urb->status)); + if (urb->actual_length < sizeof(*data)) { + netdev_warn(netdev, "%s: short int URB: %u < %zu\n", + __func__, urb->actual_length, sizeof(*data)); + goto resubmit_urb; + } + switch (urb->status) { case 0: /* success */ break;