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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 034D4C10F0C for ; Thu, 4 Apr 2019 09:38:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C930120855 for ; Thu, 4 Apr 2019 09:38:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554370734; bh=ZUotyxZFK6YExqSOu1ZLCHyzUfmdXp2U0stcDwhR3og=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rhr2nNb4LZDfpX/BvzmMPrW36WupvNNh0n7b/5uQeyb6OiyddA630/AaXYnY/kwcx KznMnAIMkNhNK0xq2+q3LDK+pXN2nkLquRoOfM5ML+Qb91X8i+8DaEORJTZztQzBRu wYgzDZulQk/wCTSh3dwizY7+ohE2k9WW/RxKyYz4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731880AbfDDJD6 (ORCPT ); Thu, 4 Apr 2019 05:03:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:41710 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731879AbfDDJD5 (ORCPT ); Thu, 4 Apr 2019 05:03:57 -0400 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 DC51E2147C; Thu, 4 Apr 2019 09:03:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1554368637; bh=ZUotyxZFK6YExqSOu1ZLCHyzUfmdXp2U0stcDwhR3og=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JZpsvoFpDzXFAoPdkm+XdA2fK/o8Ew7E2Iivs020hu+lb8yZFw+Vt0GYYjky9QMYg fXQ/gvHrfEj8XzTKfxx8nb3bNJsIBxwXZjPm9wIOaF3Ug6xJSVDe6Ybt437k7BdXCZ myc7JHHRHTJqslS36Z6CRizbmIOw6k68Sib4/W9E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michal Kazior , Jacek Anaszewski , Sasha Levin Subject: [PATCH 4.19 097/187] leds: lp55xx: fix null deref on firmware load failure Date: Thu, 4 Apr 2019 10:47:14 +0200 Message-Id: <20190404084607.738768969@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190404084603.119654039@linuxfoundation.org> References: <20190404084603.119654039@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 5ddb0869bfc1bca6cfc592c74c64a026f936638c ] I've stumbled upon a kernel crash and the logs pointed me towards the lp5562 driver: > <4>[306013.841294] lp5562 0-0030: Direct firmware load for lp5562 failed with error -2 > <4>[306013.894990] lp5562 0-0030: Falling back to user helper > ... > <3>[306073.924886] lp5562 0-0030: firmware request failed > <1>[306073.939456] Unable to handle kernel NULL pointer dereference at virtual address 00000000 > <4>[306074.251011] PC is at _raw_spin_lock+0x1c/0x58 > <4>[306074.255539] LR is at release_firmware+0x6c/0x138 > ... After taking a look I noticed firmware_release() could be called with either NULL or a dangling pointer. Fixes: 10c06d178df11 ("leds-lp55xx: support firmware interface") Signed-off-by: Michal Kazior Signed-off-by: Jacek Anaszewski Signed-off-by: Sasha Levin --- drivers/leds/leds-lp55xx-common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c index 3d79a6380761..723f2f17497a 100644 --- a/drivers/leds/leds-lp55xx-common.c +++ b/drivers/leds/leds-lp55xx-common.c @@ -201,7 +201,7 @@ static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) if (!fw) { dev_err(dev, "firmware request failed\n"); - goto out; + return; } /* handling firmware data is chip dependent */ @@ -214,9 +214,9 @@ static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) mutex_unlock(&chip->lock); -out: /* firmware should be released for other channel use */ release_firmware(chip->fw); + chip->fw = NULL; } static int lp55xx_request_firmware(struct lp55xx_chip *chip) -- 2.19.1