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[124.33.176.97]) by smtp.gmail.com with ESMTPSA id q12-20020a170902dacc00b00185402cfedesm7414472plx.246.2022.12.03.05.32.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Dec 2022 05:32:59 -0800 (PST) Sender: Vincent Mailhol From: Vincent Mailhol To: Marc Kleine-Budde , linux-can@vger.kernel.org Cc: Wolfgang Grandegger , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Frank Jungclaus , socketcan@esd.eu, Yasushi SHOJI , =?UTF-8?q?Stefan=20M=C3=A4tje?= , Hangyu Hua , Oliver Hartkopp , Peter Fink , Jeroen Hofstee , =?UTF-8?q?Christoph=20M=C3=B6hring?= , John Whittington , Vasanth Sadhasivan , Jimmy Assarsson , Anssi Hannula , Pavel Skripkin , Stephane Grosjean , Wolfram Sang , "Gustavo A . R . Silva" , Julia Lawall , Dongliang Mu , Sebastian Haas , Maximilian Schneider , Daniel Berglund , Olivier Sobrie , =?UTF-8?q?Remigiusz=20Ko=C5=82=C5=82=C4=85taj?= , Jakob Unterwurzacher , Martin Elshuber , Philipp Tomsich , Bernd Krumboeck , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Alan Stern , linux-usb@vger.kernel.org, Vincent Mailhol Subject: [PATCH 6/8] can: ucan: ucan_disconnect(): fix NULL pointer dereference Date: Sat, 3 Dec 2022 22:31:57 +0900 Message-Id: <20221203133159.94414-7-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: X-Mailing-List: linux-can@vger.kernel.org ucan 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 ucan_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: 9f2d3eae88d2 ("can: ucan: add driver for Theobroma Systems UCAN devices") Signed-off-by: Vincent Mailhol --- drivers/net/can/usb/ucan.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c index ffa38f533c35..429b3519ee7f 100644 --- a/drivers/net/can/usb/ucan.c +++ b/drivers/net/can/usb/ucan.c @@ -1579,8 +1579,6 @@ static void ucan_disconnect(struct usb_interface *intf) { struct ucan_priv *up = usb_get_intfdata(intf); - usb_set_intfdata(intf, NULL); - if (up) { unregister_candev(up->netdev); free_candev(up->netdev); -- 2.37.4