From nobody Tue Feb 10 07:44:11 2026 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5AE329A322 for ; Sat, 10 Jan 2026 17:29:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768066197; cv=none; b=LX55NcGGCPPRu0TndYq5VjnqjT9EoCJvpEmgBtho/cMiqCOmZ6/FL1z9Ci2RSu88U9HcV6J1+ZBFb9TzAskJeZ9dovNBOENE7D4stD+sLJDxtAPwTwigLbkxMdYKsyVf75IsOW1RmcOmAe9/oDfSpXfUvPNWJrhUutEOSBYENbo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768066197; c=relaxed/simple; bh=bugZjGGJr0BTLoSY0RX9evgMGVU7+BDACt3oLqrmfiE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QszCxGjAQW8xo7yIOe7XRhBBOctnK9vwSemM9+ChBwtBycPPGVtIZb/cYwlvNxyrGD1K24CjgiXQG5XRYvrmnnIfDJVaR176c29MPuo1NaMgNdUIBvyGCJAdVVusCfqCt3rNjKxGiRCw5d67OCOC+DlaPohee2ufvqUnqPoDmQQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1vecm5-0004J6-Pt; Sat, 10 Jan 2026 18:29:17 +0100 Received: from moin.white.stw.pengutronix.de ([2a0a:edc0:0:b01:1d::7b] helo=bjornoya.blackshift.org) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vecm4-00AEGI-1L; Sat, 10 Jan 2026 18:29:16 +0100 Received: from hardanger.blackshift.org (unknown [IPv6:2a03:2260:2009::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) (Authenticated sender: mkl-all@blackshift.org) by smtp.blackshift.org (Postfix) with ESMTPSA id 8A3FE4CA204; Sat, 10 Jan 2026 17:29:15 +0000 (UTC) From: Marc Kleine-Budde Date: Sat, 10 Jan 2026 18:28:52 +0100 Subject: [PATCH can 1/5] can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260110-can_usb-fix-memory-leak-v1-1-4a7c082a7081@pengutronix.de> References: <20260110-can_usb-fix-memory-leak-v1-0-4a7c082a7081@pengutronix.de> In-Reply-To: <20260110-can_usb-fix-memory-leak-v1-0-4a7c082a7081@pengutronix.de> To: Vincent Mailhol , Wolfgang Grandegger , Sebastian Haas , "David S. Miller" , Frank Jungclaus , socketcan@esd.eu, Yasushi SHOJI , Daniel Berglund , Olivier Sobrie , =?utf-8?q?Remigiusz_Ko=C5=82=C5=82=C4=85taj?= , Bernd Krumboeck Cc: kernel@pengutronix.de, linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, Marc Kleine-Budde , stable@vger.kernel.org X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=openpgp-sha256; l=1548; i=mkl@pengutronix.de; h=from:subject:message-id; bh=bugZjGGJr0BTLoSY0RX9evgMGVU7+BDACt3oLqrmfiE=; b=owEBbQGS/pANAwAKAQx0Zd/5kJGcAcsmYgBpYoxh1RY/m8CCCrdFH6QsE8NVCan9otwjYlA5h knVVEoFJfaJATMEAAEKAB0WIQSf+wzYr2eoX/wVbPMMdGXf+ZCRnAUCaWKMYQAKCRAMdGXf+ZCR nF9xCACGyOVKURclPrLDsexUe/n/a1x8NkErpAFdtu6GkJWryqcUpa2J9wVNcJmHmUvqzS6Tuqa EV2nl8ol0oFVN/s6kRvhEV2pp6/LKlvRP8+Jz+w9TmhJjdS9E1vvFDfwGvGJ9KQZwFwTaXjpj77 hQmXvany86cnKi110PGNVFgEEUlGzMuU3/CtD8U0mX8FTQo4NLmUFBfGtY+H7Z/6e0r9PQjE0zr neQac4OgDyw/CKxoQE4Ls/t9bxzxYh25f5z47dq9CadhEI/mt8USCN1CwhvmUcZtxAqRn88++V7 hkLOUIrAa5picHc30yylDyAjFDBp5qV4D6rkOkxvEML59+cU X-Developer-Key: i=mkl@pengutronix.de; a=openpgp; fpr=C1400BA0B3989E6FBC7D5B5C2B5EE211C58AEA54 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mkl@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Fix similar memory leak as in commit 7352e1d5932a ("can: gs_usb: gs_usb_receive_bulk_callback(): fix URB memory leak"). In ems_usb_open(), the URBs for USB-in transfers are allocated, added to the dev->rx_submitted anchor and submitted. In the complete callback ems_usb_read_bulk_callback(), the URBs are processed and resubmitted. In ems_usb_close() the URBs are freed by calling usb_kill_anchored_urbs(&dev->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 ems_usb_close(). Fix the memory leak by anchoring the URB in the ems_usb_read_bulk_callback() to the dev->rx_submitted anchor. Fixes: 702171adeed3 ("ems_usb: Added support for EMS CPC-USB/ARM7 CAN/USB i= nterface") Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde --- drivers/net/can/usb/ems_usb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c index de8e212a1366..f44737312b04 100644 --- a/drivers/net/can/usb/ems_usb.c +++ b/drivers/net/can/usb/ems_usb.c @@ -486,6 +486,8 @@ static void ems_usb_read_bulk_callback(struct urb *urb) urb->transfer_buffer, RX_BUFFER_SIZE, ems_usb_read_bulk_callback, dev); =20 + usb_anchor_urb(urb, &dev->rx_submitted); + retval =3D usb_submit_urb(urb, GFP_ATOMIC); =20 if (retval =3D=3D -ENODEV) --=20 2.51.0