From patchwork Mon May 16 19:36:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573836 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 344B7C4332F for ; Mon, 16 May 2022 19:47:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346034AbiEPTrO (ORCPT ); Mon, 16 May 2022 15:47:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346627AbiEPTqi (ORCPT ); Mon, 16 May 2022 15:46:38 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBEAD4162C; Mon, 16 May 2022 12:43:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 335D361557; Mon, 16 May 2022 19:43:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FA8FC36AF3; Mon, 16 May 2022 19:43:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730233; bh=BTB41/R4kJKDuRFtO1AJT/GmcZ1Qb1obV1+MMcxmR6s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f3WlRkrTB6wo5sYKFgRwLLYsPGQwPKWN1VBMCttcisqnI+kSdNU9PLDVvGCqmzYiv MO2UB0qhmEYLDCQwWIlSDm4D4UZUVD1bYs3ZYpa3UFy+DRPbUU4Arrd7KBvFxWBJg8 Br7+N4FEnUYzKbVCg/oSogFD4MxIlJWZca7heFUw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yang Yingliang , Baruch Siach Subject: [PATCH 5.4 43/43] tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe() Date: Mon, 16 May 2022 21:36:54 +0200 Message-Id: <20220516193615.989385267@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193614.714657361@linuxfoundation.org> References: <20220516193614.714657361@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yang Yingliang commit 447ee1516f19f534a228dda237eddb202f23e163 upstream. It will cause null-ptr-deref when using 'res', if platform_get_resource() returns NULL, so move using 'res' after devm_ioremap_resource() that will check it to avoid null-ptr-deref. And use devm_platform_get_and_ioremap_resource() to simplify code. Fixes: 5930cb3511df ("serial: driver for Conexant Digicolor USART") Signed-off-by: Yang Yingliang Reviewed-by: Baruch Siach Cc: stable Link: https://lore.kernel.org/r/20220505124621.1592697-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/digicolor-usart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/tty/serial/digicolor-usart.c +++ b/drivers/tty/serial/digicolor-usart.c @@ -472,10 +472,10 @@ static int digicolor_uart_probe(struct p return PTR_ERR(uart_clk); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - dp->port.mapbase = res->start; dp->port.membase = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(dp->port.membase)) return PTR_ERR(dp->port.membase); + dp->port.mapbase = res->start; irq = platform_get_irq(pdev, 0); if (irq < 0)