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([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 11 Mar 2020 06:00:09 -0700 From: Heikki Krogerus To: Greg Kroah-Hartman Cc: Hans de Goede , linux-usb@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 1/2] usb: typec: ucsi: displayport: Fix NULL pointer dereference Date: Wed, 11 Mar 2020 16:00:05 +0300 Message-Id: <20200311130006.41288-2-heikki.krogerus@linux.intel.com> In-Reply-To: <20200311130006.41288-1-heikki.krogerus@linux.intel.com> References: <20200311130006.41288-1-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: linux.intel.com Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable If the registration of the DisplayPort was not successful, or if the port does not support DisplayPort alt mode in the first place, the function ucsi_displayport_remove_partner() will fail with NULL pointer dereference when it attempts to access the driver data. Adding a check to the function to make sure there really is driver data for the device before modifying it. Fixes: af8622f6a585 ("usb: typec: ucsi: Support for DisplayPort alt mode") Reported-by: Andrea Gagliardi La Gala BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=3D206365 Cc: stable@vger.kernel.org Signed-off-by: Heikki Krogerus --- drivers/usb/typec/ucsi/displayport.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/= displayport.c index 0f1273ae086c..261131c9e37c 100644 --- a/drivers/usb/typec/ucsi/displayport.c +++ b/drivers/usb/typec/ucsi/displayport.c @@ -271,6 +271,9 @@ void ucsi_displayport_remove_partner(struct typec_altmo= de *alt) =09=09return; =20 =09dp =3D typec_altmode_get_drvdata(alt); +=09if (!dp) +=09=09return; + =09dp->data.conf =3D 0; =09dp->data.status =3D 0; =09dp->initialized =3D false; --=20 2.25.1 Delivered-To: hdegoede@gapps.redhat.com Received: by 2002:ac9:3cca:0:0:0:0:0 with SMTP id x10csp668601ocf; Wed, 11 Mar 2020 06:00:21 -0700 (PDT) X-Google-Smtp-Source: ADFU+vsGhdWLjQ3QpxqWj6WbYOo0YlQLm+xaXhCA9qDlbUCuTwO0DTYoUpCtv/Wic/3KISqZC1e0 X-Received: by 2002:a17:906:90d9:: with SMTP id v25mr2356602ejw.73.1583931621591; Wed, 11 Mar 2020 06:00:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1583931621; cv=none; d=google.com; s=arc-20160816; b=TLDfI22LVNxWmkmYrQN2uyHHPtPhg7WoBmf4iRg+OckIGdycsI9lsHbEayPwTnavnh zh/vP7ADiHK/CgvjRmi23hCcrqZchwKPBXKVGyfsW3uVNSuKzUHc/hvUeH4kyDpUkYei DYmbgn+d4egWgMwPcnILYiOOXOVCRXM5fx2dZ1fce9PUl2XNCZ2WVg4a9oRUD1sTUpSM 5bSTil75+tWtb8iWaE6mjnA9QGdt8Fro9J5c96ieLXGDeBnn17yqeV0z2x5041uCzomd VjYisvIyCmgwyrP/1rmcNiefcXT8cywY6VDBXT4iZokr9E+Uc9oaWlrr68Dknu0L9Sps kikQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:delivered-to; bh=2VcPAoJ6MUqHi98RX96U06C9ISBArMXJM424R6yWYho=; b=pgfElkmeiDab/DIqnu1P0nT7ENBYKSc1y7f0xD7a3nxknW4dRVi0JTJB0U0LlWHKMi oD+hUOzkTK7A6WFPHHQYUBwWaP1l4YyV9NttwwdNGvqJ3QPLaSRMGE1o8GMviHmTCinS wyoSx18HZANbQFED3KSI0XOvRPCxnItDbLtvd8xCCddAHkEoBJSWO2xMCxaTmiw9OrjP bJnzeQzbmEnLwTiYz/v9cwb99Rmnu8L6I/wgdbdso92c3YTO2jSCcEZcwsXOZOrrwfvB OpyJ9yZ53djiEcP9IXwuMIIuwGoo3jiRzoBTKYVvD6m/w+RUWNqyiadKfEC81qIjtM8e L0sA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of heikki.krogerus@linux.intel.com designates 134.134.136.126 as permitted sender) smtp.mailfrom=heikki.krogerus@linux.intel.com Return-Path: Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com. 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([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 11 Mar 2020 06:00:11 -0700 From: Heikki Krogerus To: Greg Kroah-Hartman Cc: Hans de Goede , linux-usb@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 2/2] usb: typec: ucsi: displayport: Fix a potential race during registration Date: Wed, 11 Mar 2020 16:00:06 +0300 Message-Id: <20200311130006.41288-3-heikki.krogerus@linux.intel.com> In-Reply-To: <20200311130006.41288-1-heikki.krogerus@linux.intel.com> References: <20200311130006.41288-1-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: linux.intel.com Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Locking the connector in ucsi_register_displayport() to make sure that nothing can access the displayport alternate mode before the function has finished and the alternate mode is actually ready. Fixes: af8622f6a585 ("usb: typec: ucsi: Support for DisplayPort alt mode") Cc: stable@vger.kernel.org Signed-off-by: Heikki Krogerus --- drivers/usb/typec/ucsi/displayport.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/= displayport.c index 261131c9e37c..048381c058a5 100644 --- a/drivers/usb/typec/ucsi/displayport.c +++ b/drivers/usb/typec/ucsi/displayport.c @@ -288,6 +288,8 @@ struct typec_altmode *ucsi_register_displayport(struct = ucsi_connector *con, =09struct typec_altmode *alt; =09struct ucsi_dp *dp; =20 +=09mutex_lock(&con->lock); + =09/* We can't rely on the firmware with the capabilities. */ =09desc->vdo |=3D DP_CAP_DP_SIGNALING | DP_CAP_RECEPTACLE; =20 @@ -296,12 +298,15 @@ struct typec_altmode *ucsi_register_displayport(struc= t ucsi_connector *con, =09desc->vdo |=3D all_assignments << 16; =20 =09alt =3D typec_port_register_altmode(con->port, desc); -=09if (IS_ERR(alt)) +=09if (IS_ERR(alt)) { +=09=09mutex_unlock(&con->lock); =09=09return alt; +=09} =20 =09dp =3D devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL); =09if (!dp) { =09=09typec_unregister_altmode(alt); +=09=09mutex_unlock(&con->lock); =09=09return ERR_PTR(-ENOMEM); =09} =20 @@ -314,5 +319,7 @@ struct typec_altmode *ucsi_register_displayport(struct = ucsi_connector *con, =09alt->ops =3D &ucsi_displayport_ops; =09typec_altmode_set_drvdata(alt, dp); =20 +=09mutex_unlock(&con->lock); + =09return alt; } --=20 2.25.1