From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CD3EC2D0C1 for ; Thu, 19 Dec 2019 18:36:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 63AFB2468F for ; Thu, 19 Dec 2019 18:36:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576780586; bh=yVAtf20W+rwO58WwpQInAJNSQ9cE/71x+A3AkJr37BE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=t7Y9XcEg3O6RM0Ak9njPa6YcEX0xOv1H+bMwEP9GZOhr9SAcszH9PCBWk+Iy7mHED jgc64rimRpXFfGoGxJtC+I9gltadHl8m43ISjHmrJhFpJAezEDm9BpDw1Xlv/L7xJb +dwmIPhx4cwvSbcfZKSSYFTzHgOuQ5T7lmMVFtwc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727574AbfLSSgZ (ORCPT ); Thu, 19 Dec 2019 13:36:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:53340 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727531AbfLSSgY (ORCPT ); Thu, 19 Dec 2019 13:36:24 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 56BD124679; Thu, 19 Dec 2019 18:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576780583; bh=yVAtf20W+rwO58WwpQInAJNSQ9cE/71x+A3AkJr37BE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gma4rZOfTv/vVRO0dLrItbYDruLj3oIwBr/1zQ4KBJ7mx7uNzNmRsERma3S12KREl MMAFvwmWaZ3UmXu+j8Iud58+Urt8CPIcoYCb3xsN1uOYWdBndacEMhytJ2xlVSLrPW ySZKLYRpZ/pE7v7mD4GFSsDLKBb3V2sxwh4oEINQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephan Gerhold , Andy Shevchenko , "David S. Miller" , Sasha Levin Subject: [PATCH 4.4 008/162] NFC: nxp-nci: Fix NULL pointer dereference after I2C communication error Date: Thu, 19 Dec 2019 19:31:56 +0100 Message-Id: <20191219183159.605318033@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191219183150.477687052@linuxfoundation.org> References: <20191219183150.477687052@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Stephan Gerhold [ Upstream commit a71a29f50de1ef97ab55c151a1598eb12dde379d ] I2C communication errors (-EREMOTEIO) during the IRQ handler of nxp-nci result in a NULL pointer dereference at the moment: BUG: kernel NULL pointer dereference, address: 0000000000000000 Oops: 0002 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 355 Comm: irq/137-nxp-nci Not tainted 5.4.0-rc6 #1 RIP: 0010:skb_queue_tail+0x25/0x50 Call Trace: nci_recv_frame+0x36/0x90 [nci] nxp_nci_i2c_irq_thread_fn+0xd1/0x285 [nxp_nci_i2c] ? preempt_count_add+0x68/0xa0 ? irq_forced_thread_fn+0x80/0x80 irq_thread_fn+0x20/0x60 irq_thread+0xee/0x180 ? wake_threads_waitq+0x30/0x30 kthread+0xfb/0x130 ? irq_thread_check_affinity+0xd0/0xd0 ? kthread_park+0x90/0x90 ret_from_fork+0x1f/0x40 Afterward the kernel must be rebooted to work properly again. This happens because it attempts to call nci_recv_frame() with skb == NULL. However, unlike nxp_nci_fw_recv_frame(), nci_recv_frame() does not have any NULL checks for skb, causing the NULL pointer dereference. Change the code to call only nxp_nci_fw_recv_frame() in case of an error. Make sure to log it so it is obvious that a communication error occurred. The error above then becomes: nxp-nci_i2c i2c-NXP1001:00: NFC: Read failed with error -121 nci: __nci_request: wait_for_completion_interruptible_timeout failed 0 nxp-nci_i2c i2c-NXP1001:00: NFC: Read failed with error -121 Fixes: 6be88670fc59 ("NFC: nxp-nci_i2c: Add I2C support to NXP NCI driver") Signed-off-by: Stephan Gerhold Reviewed-by: Andy Shevchenko Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/nfc/nxp-nci/i2c.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c index 0b1122cb5d0c8..b505a6e135b75 100644 --- a/drivers/nfc/nxp-nci/i2c.c +++ b/drivers/nfc/nxp-nci/i2c.c @@ -239,8 +239,10 @@ static irqreturn_t nxp_nci_i2c_irq_thread_fn(int irq, void *phy_id) if (r == -EREMOTEIO) { phy->hard_fault = r; - skb = NULL; - } else if (r < 0) { + if (info->mode == NXP_NCI_MODE_FW) + nxp_nci_fw_recv_frame(phy->ndev, NULL); + } + if (r < 0) { nfc_err(&client->dev, "Read failed with error %d\n", r); goto exit_irq_handled; } -- 2.20.1