From nobody Fri Dec 19 12:31:47 2025 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 56DBA1411D5 for ; Sat, 27 Apr 2024 17:50:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714240216; cv=none; b=c+O/gyxSj1kq8sMV4WmMFhVtDd7Ilr/GUuNDROkogawi255yIkCzjwExp2F5uei+S31He0fgGb8Qo7Du3v7ktHixCTK10tOV3FD2Dm1h31iZnb1j2yFGL3raaKVEe7sn50C+Gyu07ZmzfXYdeEsD7cvNn3ziHpmihaNJMFUxta4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714240216; c=relaxed/simple; bh=HPEmpGV8ikOGmRuJrVPlO+Cc678t+l647LTwRvWKw8Y=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=pahH3wW1f23zJOr1qrVVd5WJZ4rHSLylTuWbZIoZ4TC4rIrYAqJfrl5h9O7UHG3lqd1SIqcKMBkZQum018SzhenRaRiQUHF2/P+io7D/mAgQ6p7pJs7sV6g7UtkTAxtEgEGw7eSe2H+P9I23IX2B0pDON7tWF1Izryy6X8imex8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--badhri.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=3YN2pcLa; arc=none smtp.client-ip=209.85.210.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--badhri.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="3YN2pcLa" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-6ed03216b70so3170328b3a.3 for ; Sat, 27 Apr 2024 10:50:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1714240215; x=1714845015; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=FvHMe73fi2IbWQfQ1tIXOVg2/1YesXICaNMQ7jwXAkM=; b=3YN2pcLax/LQUI9ikICdUoQ+zyBXMh5n0f6gxbp8MbXc18pecP4qC7mPE5WRiiFjvx 4dNPA1/G2qDu3t2ZjrK8QsvMhWVt/f+pswvlyMLDzupbKHL0hzVziwj0nKVBQUNWerxK GB1oY/b8VCyscUwecRk1xTAinxNTNYuJv7KZxHo5ywSxvLLIKpC1HsEUQ4vW9pCXqJ2Z i9+eJAeWAxpQVg1OIgMe9pSzPMxqYafKCSTuhQNJgYPyoxZQ0GUzFTaNbWsvFhxsyRyB tCRygilT6n69yIMN6Y7D3NzQv99ktai4y0VoPc1Lp8fyy+V2SCEzHVUP28j5FDK3PZlX 9DOQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714240215; x=1714845015; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=FvHMe73fi2IbWQfQ1tIXOVg2/1YesXICaNMQ7jwXAkM=; b=CWwlgibUFcwVKbWDUt7/EbIefc7wZoy0lfuM2g8RWcPbyDrkQ9YdjPe4/UR4hN7LKJ UqThyw54W7R1Ng/ANiub4va0dgwv3Ujovw/1ZyrydSRk6tpX9bf/g9bhOBgubpW1Qmee 6frHyZJ0YmrIh3yyYaWAspsrq3AeLxCwKWjC1RRWZDwlps3LIBVJ92a6yir0UwNrq/eb mupquPPxUdF8XfjiDSPWzVpq9xIvUML9XufZmXu3J9Hn2pNXc2vBmBVHhAJPw0CFoq+u /6attd+x35oAvLExiys2QHks86zxCXW6+vGBKqPVNyt7wwgs2SQXdryGg1T6Lefqd4IX SsSQ== X-Forwarded-Encrypted: i=1; AJvYcCW6pAyCElFAHWy9YnE8TSL9keRYs3QhJG1DZ0WEZV6H+vDj0nWqu61AOmRnPvUR0gOyX9UWeLDZMQPknD6ShaeS9W8pSy72du9lvtU/ X-Gm-Message-State: AOJu0YzphaXjZ55Rn9IOajfWjYpbF6Kv95yl6PKgWzbykUXKukz6oBqa QfJTGcvEQUwqDTZfCbebwIwnFTP6GN79lBq0b1emVIw500c2RKO6Hc37XbR4syHA8ObJgpOHsp0 Ljg== X-Google-Smtp-Source: AGHT+IGEpg5uSIhdwXNozIFHlt39+Ph13USP/g2rCrjlvxbhTvA61K8s6M02/Abp83Y8ZnWPy5PeCj9ONqA= X-Received: from badhri.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:6442]) (user=badhri job=sendgmr) by 2002:a05:6a00:2e85:b0:6f3:f514:ec1c with SMTP id fd5-20020a056a002e8500b006f3f514ec1cmr101792pfb.1.1714240214608; Sat, 27 Apr 2024 10:50:14 -0700 (PDT) Date: Sat, 27 Apr 2024 17:50:10 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.44.0.769.g3c40516874-goog Message-ID: <20240427175010.3367154-1-badhri@google.com> Subject: [PATCH v1] usb: typec: tcpm: Check for port partner validity before consuming it From: Badhri Jagan Sridharan To: gregkh@linuxfoundation.org, linux@roeck-us.net, heikki.krogerus@linux.intel.com Cc: kyletso@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, rdbabiera@google.com, amitsd@google.com, stable@vger.kernel.org, frank.wang@rock-chips.com, broonie@kernel.org, Badhri Jagan Sridharan Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" typec_register_partner() does not guarantee partner registration to always succeed. In the event of failure, port->partner is set to the error value or NULL. Given that port->partner validity is not checked, this results in the following crash: [17514.377076][ T275] Unable to handle kernel NULL pointer dereference at = virtual address 00000000000003c0 [17514.378270][ T275] pc : run_state_machine+0x1bc8/0x1c08 [17514.378286][ T275] lr : run_state_machine+0x1b90/0x1c08 .. [17514.378377][ T275] Call trace: [17514.378381][ T275] run_state_machine+0x1bc8/0x1c08 [17514.378388][ T275] tcpm_state_machine_work+0x94/0xe4 [17514.378396][ T275] kthread_worker_fn+0x118/0x328 [17514.378406][ T275] kthread+0x1d0/0x23c [17514.378412][ T275] ret_from_fork+0x10/0x20 To prevent the crash, check for port->partner validity before derefencing it in all the call sites. Cc: stable@vger.kernel.org Fixes: c97cd0b4b54e ("usb: typec: tcpm: set initial svdm version based on p= d revision") Signed-off-by: Badhri Jagan Sridharan --- drivers/usb/typec/tcpm/tcpm.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index ab6ed6111ed0..8a4fa8d875c6 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -4,7 +4,6 @@ * * USB Power Delivery protocol stack. */ - #include #include #include @@ -1580,7 +1579,8 @@ static void svdm_consume_identity(struct tcpm_port *p= ort, const u32 *p, int cnt) port->partner_ident.cert_stat =3D p[VDO_INDEX_CSTAT]; port->partner_ident.product =3D product; =20 - typec_partner_set_identity(port->partner); + if (!IS_ERR_OR_NULL(port->partner)) + typec_partner_set_identity(port->partner); =20 tcpm_log(port, "Identity: %04x:%04x.%04x", PD_IDH_VID(vdo), @@ -1742,6 +1742,9 @@ static void tcpm_register_partner_altmodes(struct tcp= m_port *port) struct typec_altmode *altmode; int i; =20 + if (IS_ERR_OR_NULL(port->partner)) + return; + for (i =3D 0; i < modep->altmodes; i++) { altmode =3D typec_partner_register_altmode(port->partner, &modep->altmode_desc[i]); @@ -4244,7 +4247,8 @@ static void tcpm_typec_connect(struct tcpm_port *port) port->partner =3D typec_register_partner(port->typec_port, &port->partner_desc); port->connected =3D true; - typec_partner_set_usb_power_delivery(port->partner, port->partner_pd); + if (!IS_ERR_OR_NULL(port->partner)) + typec_partner_set_usb_power_delivery(port->partner, port->partner_pd); } } =20 @@ -4323,8 +4327,10 @@ static void tcpm_typec_disconnect(struct tcpm_port *= port) port->plug_prime =3D NULL; port->cable =3D NULL; if (port->connected) { - typec_partner_set_usb_power_delivery(port->partner, NULL); - typec_unregister_partner(port->partner); + if (!IS_ERR_OR_NULL(port->partner)) { + typec_partner_set_usb_power_delivery(port->partner, NULL); + typec_unregister_partner(port->partner); + } port->partner =3D NULL; port->connected =3D false; } @@ -4549,6 +4555,9 @@ static enum typec_cc_status tcpm_pwr_opmode_to_rp(enu= m typec_pwr_opmode opmode) =20 static void tcpm_set_initial_svdm_version(struct tcpm_port *port) { + if (IS_ERR_OR_NULL(port->partner)) + return; + switch (port->negotiated_rev) { case PD_REV30: break; base-commit: 3f12222a4bebeb13ce06ddecc1610ad32fa835dd --=20 2.44.0.769.g3c40516874-goog