Message ID | 20221203133159.94414-4-mailhol.vincent@wanadoo.fr (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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[124.33.176.97]) by smtp.gmail.com with ESMTPSA id q12-20020a170902dacc00b00185402cfedesm7414472plx.246.2022.12.03.05.32.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Dec 2022 05:32:38 -0800 (PST) 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 Cc: Wolfgang Grandegger <wg@grandegger.com>, "David S . Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Frank Jungclaus <frank.jungclaus@esd.eu>, socketcan@esd.eu, Yasushi SHOJI <yashi@spacecubics.com>, =?utf-8?q?Stefan_M=C3=A4tje?= <stefan.maetje@esd.eu>, Hangyu Hua <hbh25y@gmail.com>, Oliver Hartkopp <socketcan@hartkopp.net>, Peter Fink <pfink@christ-es.de>, Jeroen Hofstee <jhofstee@victronenergy.com>, =?utf-8?q?Christoph_M=C3=B6hring?= <cmoehring@christ-es.de>, John Whittington <git@jbrengineering.co.uk>, Vasanth Sadhasivan <vasanth.sadhasivan@samsara.com>, Jimmy Assarsson <extja@kvaser.com>, Anssi Hannula <anssi.hannula@bitwise.fi>, Pavel Skripkin <paskripkin@gmail.com>, Stephane Grosjean <s.grosjean@peak-system.com>, Wolfram Sang <wsa+renesas@sang-engineering.com>, "Gustavo A . R . Silva" <gustavoars@kernel.org>, Julia Lawall <Julia.Lawall@inria.fr>, Dongliang Mu <dzm91@hust.edu.cn>, Sebastian Haas <haas@ems-wuensche.com>, Maximilian Schneider <max@schneidersoft.net>, Daniel Berglund <db@kvaser.com>, Olivier Sobrie <olivier@sobrie.be>, =?utf-8?b?UmVtaWdpdXN6IEtvxYLFgsSFdGFq?= <remigiusz.kollataj@mobica.com>, Jakob Unterwurzacher <jakob.unterwurzacher@theobroma-systems.com>, Martin Elshuber <martin.elshuber@theobroma-systems.com>, Philipp Tomsich <philipp.tomsich@theobroma-systems.com>, Bernd Krumboeck <b.krumboeck@gmail.com>, 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 3/8] can: gs_usb: gs_usb_disconnect(): fix NULL pointer dereference Date: Sat, 3 Dec 2022 22:31:54 +0900 Message-Id: <20221203133159.94414-4-mailhol.vincent@wanadoo.fr> X-Mailer: git-send-email 2.37.4 In-Reply-To: <20221203133159.94414-1-mailhol.vincent@wanadoo.fr> References: <20221203133159.94414-1-mailhol.vincent@wanadoo.fr> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: <linux-usb.vger.kernel.org> X-Mailing-List: linux-usb@vger.kernel.org |
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can: usb: remove all usb_set_intfdata(intf, NULL) in drivers' disconnect()
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diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index 838744d2ce34..97b1da8fd19f 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -1458,8 +1458,6 @@ static void gs_usb_disconnect(struct usb_interface *intf) struct gs_usb *dev = usb_get_intfdata(intf); unsigned int i; - usb_set_intfdata(intf, NULL); - if (!dev) { dev_err(&intf->dev, "Disconnect (nodata)\n"); return;
gs_usb sets the usb_interface to NULL before waiting for the completion of outstanding urbs. This can result 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 gs_usb_disconnect() at [3]. [1] commit 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: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices") Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> --- drivers/net/can/usb/gs_usb.c | 2 -- 1 file changed, 2 deletions(-)