linux-kernel - [PATCH can] can: gs_usb: gs_usb_receive_bulk

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Message-Id: <20251225-gs_usb-fix-memory-leak-v1-1-a7b09e70d01d@pengutronix.de>
Date: Thu, 25 Dec 2025 15:05:43 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Vincent Mailhol <mailhol@...nel.org>
Cc: kernel@...gutronix.de, linux-can@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH can] can: gs_usb: gs_usb_receive_bulk_callback(): fix URB
 memory leak

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: f16623a04943 ("can: gs_usb: fix")
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 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: 6402078bd9d1ed46e79465e1faaa42e3458f8a33
change-id: 20251225-gs_usb-fix-memory-leak-062c24898cc9

Best regards,
--  
Marc Kleine-Budde <mkl@...gutronix.de>