linux-kernel - [PATCH can 5/5] can: usb_8dev: usb_8dev_read_bulk

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Message-Id: <20260110-can_usb-fix-memory-leak-v1-5-4a7c082a7081@pengutronix.de>
Date: Sat, 10 Jan 2026 18:28:56 +0100
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Vincent Mailhol <mailhol@...nel.org>, 
 Wolfgang Grandegger <wg@...ndegger.com>, 
 Sebastian Haas <haas@...-wuensche.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Frank Jungclaus <frank.jungclaus@....eu>, socketcan@....eu, 
 Yasushi SHOJI <yashi@...cecubics.com>, Daniel Berglund <db@...ser.com>, 
 Olivier Sobrie <olivier@...rie.be>, 
 Remigiusz Kołłątaj <remigiusz.kollataj@...ica.com>, 
 Bernd Krumboeck <b.krumboeck@...il.com>
Cc: kernel@...gutronix.de, linux-can@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>, 
 stable@...r.kernel.org
Subject: [PATCH can 5/5] can: usb_8dev: usb_8dev_read_bulk_callback(): fix
 URB memory leak

Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb:
gs_usb_receive_bulk_callback(): fix URB memory leak").

In usb_8dev_open() -> usb_8dev_start(), the URBs for USB-in transfers are
allocated, added to the priv->rx_submitted anchor and submitted. In the
complete callback usb_8dev_read_bulk_callback(), the URBs are processed and
resubmitted. In usb_8dev_close() -> unlink_all_urbs() the URBs are freed by
calling usb_kill_anchored_urbs(&priv->rx_submitted).

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

Fix the memory leak by anchoring the URB in the
usb_8dev_read_bulk_callback() to the priv->rx_submitted anchor.

Fixes: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/usb_8dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 7449328f7cd7..f5896416a780 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -541,6 +541,8 @@ static void usb_8dev_read_bulk_callback(struct urb *urb)
 			  urb->transfer_buffer, RX_BUFFER_SIZE,
 			  usb_8dev_read_bulk_callback, priv);

+	usb_anchor_urb(urb, &priv->rx_submitted);
+
 	retval = usb_submit_urb(urb, GFP_ATOMIC);

 	if (retval == -ENODEV)

-- 
2.51.0