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Sender: Vincent Mailhol <vincent.mailhol@gmail.com>
From:   Vincent Mailhol <mailhol.vincent@wanadoo.fr>
To:     Marc Kleine-Budde <mkl@pengutronix.de>, linux-can@vger.kernel.org
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        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Alan Stern <stern@rowland.harvard.edu>,
        linux-usb@vger.kernel.org,
        Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Subject: [PATCH v2 2/9] can: esd_usb: esd_usb_disconnect(): fix NULL pointer dereference
Date:   Sat, 10 Dec 2022 18:01:50 +0900
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 <20221210090157.793547-1-mailhol.vincent@wanadoo.fr>
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esd_usb sets the driver's priv data to NULL before waiting for the
completion of outsdanding urbs. This can results in NULL pointer
dereference, c.f. [1] and [2].

Remove the call to usb_set_intfdata(intf, NULL). The core will take
care of setting it to NULL after esd_usb_disconnect() at [3].

[1] c/27ef17849779 ("usb: add usb_set_intfdata() documentation")
Link: https://git.kernel.org/gregkh/usb/c/27ef17849779

[2] thread about usb_set_intfdata() on linux-usb mailing.
Link: https://lore.kernel.org/linux-usb/Y4OD70GD4KnoRk0k@rowland.harvard.edu/

[3] function usb_unbind_interface() from drivers/usb/core/driver.c
Link: https://elixir.bootlin.com/linux/v6.0/source/drivers/usb/core/driver.c#L497

Fixes: 96d8e90382dc ("can: Add driver for esd CAN-USB/2 device")
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
@stable team: the file was renamed from esd_usb2.c to esd_usb.c in [4].

[4] 5e910bdedc84 ("can/esd_usb2: Rename esd_usb2.c to esd_usb.c")
---
 drivers/net/can/usb/esd_usb.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c
index 81b88e9e5bdc..f3006c6dc5d6 100644
--- a/drivers/net/can/usb/esd_usb.c
+++ b/drivers/net/can/usb/esd_usb.c
@@ -1127,8 +1127,6 @@ static void esd_usb_disconnect(struct usb_interface *intf)
 	device_remove_file(&intf->dev, &dev_attr_hardware);
 	device_remove_file(&intf->dev, &dev_attr_nets);
 
-	usb_set_intfdata(intf, NULL);
-
 	if (dev) {
 		for (i = 0; i < dev->net_count; i++) {
 			if (dev->nets[i]) {
-- 
2.37.4