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 C2E2712EBCA; Tue, 14 May 2024 11:22:19 +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=1715685739; cv=none; b=up/EpzOWFUo66LBedqXyf7MwCyMQCuD4dIrVOTNEuuRW8+ORJepQyKJs/OdyEkKj+5ZOxnCtTMO3tC5+UcjrNiyeyPJYbWwiba/gvWlE3WCeX6tOUK0rGcWeRCjU4pxHXntqBf7ZM79OkIPpaW2j3D63SJ69LQ37iH5TqDK+dto= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715685739; c=relaxed/simple; bh=4xrYzcM4bG1Gcs71cv5/mR1Xce+q2FTkBOpPVIHmz3o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QvgEBiPiEVgmKQVqIW3Dcou4GCdWLDfUMT6tuLOoldyA4j/+0aSIfGjYl4VJ8+SvFZO7tWJvNjeMMxaGzjYDo9l6Itb2Izgk7S3DkfZZ70scV0QzePcukWev2xJZYw1kU8V6QdvOOwwjsoKG4pAzP3ezkVsjJmOdjjN1yiMRa14= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NH5ewGNt; 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="NH5ewGNt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9477DC32781; Tue, 14 May 2024 11:22:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1715685739; bh=4xrYzcM4bG1Gcs71cv5/mR1Xce+q2FTkBOpPVIHmz3o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NH5ewGNt1I6Sr2jmcavEPw85B99DH6aAW24n7TYqxTfH3fVRS82H7QQjxrWOpFwtc IQmMWtJSdzhgIl+1JMAAJ7yf54Tkv/pyjH5z8i8VkDV62KTKY9wP5qrTCOok4ns5ZE yx1K13qfKOCIp4l6wVSe7H7s9zR/GyJhEEbb6s+k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Badhri Jagan Sridharan , Heikki Krogerus , Dmitry Baryshkov Subject: [PATCH 6.6 238/301] usb: typec: tcpm: Check for port partner validity before consuming it Date: Tue, 14 May 2024 12:18:29 +0200 Message-ID: <20240514101041.240519279@linuxfoundation.org> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240514101032.219857983@linuxfoundation.org> References: <20240514101032.219857983@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Badhri Jagan Sridharan commit ae11f04b452b5205536e1c02d31f8045eba249dd upstream. 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: Unable to handle kernel NULL pointer dereference at virtual address xx pc : run_state_machine+0x1bc8/0x1c08 lr : run_state_machine+0x1b90/0x1c08 .. Call trace: run_state_machine+0x1bc8/0x1c08 tcpm_state_machine_work+0x94/0xe4 kthread_worker_fn+0x118/0x328 kthread+0x1d0/0x23c 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 pd revision") Signed-off-by: Badhri Jagan Sridharan Reviewed-by: Heikki Krogerus Reviewed-by: Dmitry Baryshkov Link: https://lore.kernel.org/r/20240427202812.3435268-1-badhri@google.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/tcpm/tcpm.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -1488,7 +1488,8 @@ static void svdm_consume_identity(struct port->partner_ident.cert_stat = p[VDO_INDEX_CSTAT]; port->partner_ident.product = product; - typec_partner_set_identity(port->partner); + if (port->partner) + typec_partner_set_identity(port->partner); tcpm_log(port, "Identity: %04x:%04x.%04x", PD_IDH_VID(vdo), @@ -1576,6 +1577,9 @@ static void tcpm_register_partner_altmod struct typec_altmode *altmode; int i; + if (!port->partner) + return; + for (i = 0; i < modep->altmodes; i++) { altmode = typec_partner_register_altmode(port->partner, &modep->altmode_desc[i]); @@ -3574,7 +3578,10 @@ static int tcpm_init_vconn(struct tcpm_p static void tcpm_typec_connect(struct tcpm_port *port) { + struct typec_partner *partner; + if (!port->connected) { + port->connected = true; /* Make sure we don't report stale identity information */ memset(&port->partner_ident, 0, sizeof(port->partner_ident)); port->partner_desc.usb_pd = port->pd_capable; @@ -3584,9 +3591,13 @@ static void tcpm_typec_connect(struct tc port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO; else port->partner_desc.accessory = TYPEC_ACCESSORY_NONE; - port->partner = typec_register_partner(port->typec_port, - &port->partner_desc); - port->connected = true; + partner = typec_register_partner(port->typec_port, &port->partner_desc); + if (IS_ERR(partner)) { + dev_err(port->dev, "Failed to register partner (%ld)\n", PTR_ERR(partner)); + return; + } + + port->partner = partner; typec_partner_set_usb_power_delivery(port->partner, port->partner_pd); } } @@ -3656,9 +3667,11 @@ out_disable_mux: static void tcpm_typec_disconnect(struct tcpm_port *port) { if (port->connected) { - typec_partner_set_usb_power_delivery(port->partner, NULL); - typec_unregister_partner(port->partner); - port->partner = NULL; + if (port->partner) { + typec_partner_set_usb_power_delivery(port->partner, NULL); + typec_unregister_partner(port->partner); + port->partner = NULL; + } port->connected = false; } } @@ -3874,6 +3887,9 @@ static enum typec_cc_status tcpm_pwr_opm static void tcpm_set_initial_svdm_version(struct tcpm_port *port) { + if (!port->partner) + return; + switch (port->negotiated_rev) { case PD_REV30: break;