In gs_can_open(), the URBs for USB-in transfers are allocated, added to the parent->rx_submitted anchor and submitted. In the complete callback gs_usb_receive_bulk_callback(), the URB is processed and resubmitted. In gs_can_close() the URBs are freed by calling usb_kill_anchored_urbs(parent->rx_submitted).

However, this does not take into account that the USB framework unanchors the URB before the close function is called. This means that once an in-URB has been completed, it is no longer anchored and is ultimately not released in gs_can_close().

Fix the memory leak by anchoring the URB in the gs_usb_receive_bulk_callback() to the parent->rx_submitted anchor.

Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices") Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- Changes in v2: - correct "Fixes" tag - add stable@v.k.o on Cc - Link to v1: https://patch.msgid.link/20251225-gs_usb-fix-memory-leak-v1-1-a7b09e70d01d@p... --- drivers/net/can/usb/gs_usb.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index a0233e550a5a..d093babbc320 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -751,6 +751,8 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) hf, parent->hf_size_rx, gs_usb_receive_bulk_callback, parent);

+ usb_anchor_urb(urb, &parent->rx_submitted); + rc = usb_submit_urb(urb, GFP_ATOMIC);

/* USB failure take down all interfaces */

--- base-commit: 1806d210e5a8f431ad4711766ae4a333d407d972 change-id: 20251225-gs_usb-fix-memory-leak-062c24898cc9

Best regards, -- Marc Kleine-Budde mkl@pengutronix.de