From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 16A7E1917E3; Tue, 29 Apr 2025 17:39:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948346; cv=none; b=bWHxyCo4MSg+1xXjnVrDbMtXnCWsU0DPMz82fgyNH5PJV1ZkrF2j3dUnZDNB+CFTFH66KALFDehhvYEGRNol/su35DyEk7rc3b30pZM3D7NPXDBfXymB0dp82Jl8NlJmAwk0lpGJ2zb8KhEzCFlzSjylFjdoPTQWGAuRPiWwZwQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948346; c=relaxed/simple; bh=okEiGwmzKoERpUky7u4kX4hl4+W9dWHI2LG+i0NTWRk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CGvRB4G9DSUGFSRC4NNSTCnqJ9XiQVQJul9kFf2JSBQ5OIytIwClm9f1BClwmaYiIo8LTfT934G289vgB8S9CByEQrg2UvVlhZ4x5ZpxqHYA3GiZNB2uxcBX2lKkhVIH/BugR/Narn2/OnsrVtnRV99z7KJPw1HM2ifcdirr1yY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Cilttp3d; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Cilttp3d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C9D4C4CEE3; Tue, 29 Apr 2025 17:39:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745948346; bh=okEiGwmzKoERpUky7u4kX4hl4+W9dWHI2LG+i0NTWRk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cilttp3dLrWLVDa2QyEsPrnecrL3EE0cm5B0W6lWwfAe0YJmbTb2LOwq+Ho4GF1EK pXQSGOVVAz8Gy0g1zGOwYhmCzvzlGfI0qGDh5llhNR97pLbmqe/AzLO8hUaFsYFTIJ a6vX8VU2kGU1jgBRBlCGKEoAUgFaUeg7m5Dunw5U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andrei Kuchynski , Benson Leung , Heikki Krogerus Subject: [PATCH 6.12 259/280] usb: typec: class: Fix NULL pointer access Date: Tue, 29 Apr 2025 18:43:20 +0200 Message-ID: <20250429161125.733215332@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161115.008747050@linuxfoundation.org> References: <20250429161115.008747050@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrei Kuchynski commit ec27386de23a511008c53aa2f3434ad180a3ca9a upstream. Concurrent calls to typec_partner_unlink_device can lead to a NULL pointer dereference. This patch adds a mutex to protect USB device pointers and prevent this issue. The same mutex protects both the device pointers and the partner device registration. Cc: stable@vger.kernel.org Fixes: 59de2a56d127 ("usb: typec: Link enumerated USB devices with Type-C partner") Signed-off-by: Andrei Kuchynski Reviewed-by: Benson Leung Reviewed-by: Heikki Krogerus Link: https://lore.kernel.org/r/20250321143728.4092417-2-akuchynski@chromium.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/class.c | 15 +++++++++++++-- drivers/usb/typec/class.h | 1 + 2 files changed, 14 insertions(+), 2 deletions(-) --- a/drivers/usb/typec/class.c +++ b/drivers/usb/typec/class.c @@ -932,6 +932,7 @@ struct typec_partner *typec_register_par partner->dev.type = &typec_partner_dev_type; dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev)); + mutex_lock(&port->partner_link_lock); ret = device_register(&partner->dev); if (ret) { dev_err(&port->dev, "failed to register partner (%d)\n", ret); @@ -943,6 +944,7 @@ struct typec_partner *typec_register_par typec_partner_link_device(partner, port->usb2_dev); if (port->usb3_dev) typec_partner_link_device(partner, port->usb3_dev); + mutex_unlock(&port->partner_link_lock); return partner; } @@ -963,12 +965,14 @@ void typec_unregister_partner(struct typ port = to_typec_port(partner->dev.parent); + mutex_lock(&port->partner_link_lock); if (port->usb2_dev) typec_partner_unlink_device(partner, port->usb2_dev); if (port->usb3_dev) typec_partner_unlink_device(partner, port->usb3_dev); device_unregister(&partner->dev); + mutex_unlock(&port->partner_link_lock); } EXPORT_SYMBOL_GPL(typec_unregister_partner); @@ -1862,25 +1866,30 @@ static struct typec_partner *typec_get_p static void typec_partner_attach(struct typec_connector *con, struct device *dev) { struct typec_port *port = container_of(con, struct typec_port, con); - struct typec_partner *partner = typec_get_partner(port); + struct typec_partner *partner; struct usb_device *udev = to_usb_device(dev); + mutex_lock(&port->partner_link_lock); if (udev->speed < USB_SPEED_SUPER) port->usb2_dev = dev; else port->usb3_dev = dev; + partner = typec_get_partner(port); if (partner) { typec_partner_link_device(partner, dev); put_device(&partner->dev); } + mutex_unlock(&port->partner_link_lock); } static void typec_partner_deattach(struct typec_connector *con, struct device *dev) { struct typec_port *port = container_of(con, struct typec_port, con); - struct typec_partner *partner = typec_get_partner(port); + struct typec_partner *partner; + mutex_lock(&port->partner_link_lock); + partner = typec_get_partner(port); if (partner) { typec_partner_unlink_device(partner, dev); put_device(&partner->dev); @@ -1890,6 +1899,7 @@ static void typec_partner_deattach(struc port->usb2_dev = NULL; else if (port->usb3_dev == dev) port->usb3_dev = NULL; + mutex_unlock(&port->partner_link_lock); } /** @@ -2425,6 +2435,7 @@ struct typec_port *typec_register_port(s ida_init(&port->mode_ids); mutex_init(&port->port_type_lock); + mutex_init(&port->partner_link_lock); port->id = id; port->ops = cap->ops; --- a/drivers/usb/typec/class.h +++ b/drivers/usb/typec/class.h @@ -56,6 +56,7 @@ struct typec_port { enum typec_pwr_opmode pwr_opmode; enum typec_port_type port_type; struct mutex port_type_lock; + struct mutex partner_link_lock; enum typec_orientation orientation; struct typec_switch *sw;