From patchwork Sat Apr 27 20:28:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 793017 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 EF8951448DE for ; Sat, 27 Apr 2024 20:28:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714249699; cv=none; b=P9773ir9zed8X4+achpMAcdxRtYucRwcad8Q8fbz9etGY5AeVdJLUQmMWZ9BeoOHjymCZFPPS76MfTLTKevfIvIMmDU5633p+xlWpJSaSS2cNER9Md8p3qR3j3C1n9pYzrDrHVAgUTD6ryQRMQj5w6nXcwGz4Zwd41E2VmtHjGg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714249699; c=relaxed/simple; bh=V73WW+nskmomT0tPd+6B81O72ANIKsXdEIUpthWEsFA=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=N0m/s1/Ita1lvyimkjBxssWkPuTmM0brrEe8A+J0i6eBk07FqtxLBjvB3Yu2epAlZ1SFMZvPpa69t7KT/XzpZS5HEjPX4cs2t+42v/NE04bWmlicvjYS226wUPeWYShK4NtiUGs8UMXi2rQ16Kr2Nndt8+p1jl63qSyjVhcGXWA= 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=pBN2VjMK; arc=none smtp.client-ip=209.85.128.202 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="pBN2VjMK" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-61b13ce3daaso72334837b3.0 for ; Sat, 27 Apr 2024 13:28:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1714249697; x=1714854497; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=ylRat3ryBNNKSjCjBNxN3X4rZSrP8oWTwLpqPsqaRjI=; b=pBN2VjMKTd+4R7g0kQvsBDpBqhJlRgiRR6PGSeqamb+uZjvyhdF4kjlpKvV9sbzoWx YriejgA4nb7jijkoQryFDTBOVjt6m85aPYT9GgqjGG8uPk1HdcdvhIdbrUEErHuccvL8 HGn675nXPfIFIxfetPseQynCPUKLvEfXakPEWFaSHumATfTpS5Qx8FlNibh4NspU/DNj VR7tT+cqLi9anErqX2dR1uh0ZVGU5b4XGj3Yo8Og6KUt5KZ4A70Mn6e7rXOqzeEujDkW TWoA12N0BDb3nf8KFEWlx3wIscO+1oOxYyNl20UF2aHSGuKIrCQVZtA5rBMf5t9eBrdl oIZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1714249697; x=1714854497; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ylRat3ryBNNKSjCjBNxN3X4rZSrP8oWTwLpqPsqaRjI=; b=uDI8H4yuzkzqh03QBBJ0Ypr/TRdanVmu/8eXZDdtJ3gji1USPM57DUc3zXw/b5Yulm duIuIfptTkGrjjH2Ht3UHSlPJMbYnI2fgq9mvtE36O5A7Tvle0o7dYkvUHnuFaXOhGr4 VWelTCf8bqypaJO9sKpG6u5tek+5nQYDnFSAp7hdOdwhC8m52aHihYGZvMV7tvXjcbxy 44/upUzAP2lveUoRGNumFDtAUuYyINPvtC8w8NG64fSFaUFYvhzpGw67/NGnyiLiaaBE 7jUegj1COAeiqNlTPju7mYx8AX1xKnnDWWqwnqntIDG6fFG3UbfozpXUUnhPBsuCf9NJ erBA== X-Forwarded-Encrypted: i=1; AJvYcCW4Zx38EGOq+yY5lcLoRxBV+uGwUrcS9EyNjvCn1sFe9wwQHxeHf1ue2mwF5pJDUlPshi5wIPKsh62k5by+IkkVSsjjdDlOY5/t X-Gm-Message-State: AOJu0YyaEJ0Fqlhe+PHW/Yc1x0Y/kWhBuDFjZ0m4APhk/xv2qeoKDMHA SfedVkH+3Ieo/d0+W9rjj+2Cb1f0ai8jrKUHPpksc8DfE0qXh2HgogsRbEM8Ao7VM/HZKrEGxmz QWw== X-Google-Smtp-Source: AGHT+IGkMq5vFM0k2Xat2pYrsrj2ZDMri+8sn0ndwQCamks5vPEx35gvjfLOXFnev4t0SDDU7WASi4/aZRQ= X-Received: from badhri.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:6442]) (user=badhri job=sendgmr) by 2002:a81:a1c8:0:b0:615:33de:61d5 with SMTP id y191-20020a81a1c8000000b0061533de61d5mr1547806ywg.1.1714249696905; Sat, 27 Apr 2024 13:28:16 -0700 (PDT) Date: Sat, 27 Apr 2024 20:28:12 +0000 Precedence: bulk X-Mailing-List: linux-usb@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: <20240427202812.3435268-1-badhri@google.com> Subject: [PATCH v3] 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, dmitry.baryshkov@linaro.org, Badhri Jagan Sridharan 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 --- drivers/usb/typec/tcpm/tcpm.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) base-commit: 3f12222a4bebeb13ce06ddecc1610ad32fa835dd diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index ab6ed6111ed0..e1c6dffe5f8b 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -1580,7 +1580,8 @@ static void svdm_consume_identity(struct tcpm_port *port, const u32 *p, int cnt) 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), @@ -1742,6 +1743,9 @@ static void tcpm_register_partner_altmodes(struct tcpm_port *port) 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]); @@ -4231,7 +4235,10 @@ static int tcpm_init_vconn(struct tcpm_port *port) 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; @@ -4241,9 +4248,13 @@ static void tcpm_typec_connect(struct tcpm_port *port) 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); } } @@ -4323,9 +4334,11 @@ static void tcpm_typec_disconnect(struct tcpm_port *port) port->plug_prime = NULL; port->cable = NULL; 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; } } @@ -4549,6 +4562,9 @@ static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode) static void tcpm_set_initial_svdm_version(struct tcpm_port *port) { + if (!port->partner) + return; + switch (port->negotiated_rev) { case PD_REV30: break;