From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:55450 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754050AbeDKSii (ORCPT ); Wed, 11 Apr 2018 14:38:38 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pan Bian , Felipe Balbi , Sasha Levin Subject: [PATCH 3.18 024/121] usb: dwc3: keystone: check return value Date: Wed, 11 Apr 2018 20:35:27 +0200 Message-Id: <20180411183457.598105588@linuxfoundation.org> In-Reply-To: <20180411183456.195010921@linuxfoundation.org> References: <20180411183456.195010921@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pan Bian [ Upstream commit 018047a1dba7636e1f7fdae2cc290a528991d648 ] Function devm_clk_get() returns an ERR_PTR when it fails. However, in function kdwc3_probe(), its return value is not checked, which may result in a bad memory access bug. This patch fixes the bug. Signed-off-by: Pan Bian Signed-off-by: Felipe Balbi Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/dwc3-keystone.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/usb/dwc3/dwc3-keystone.c +++ b/drivers/usb/dwc3/dwc3-keystone.c @@ -117,6 +117,10 @@ static int kdwc3_probe(struct platform_d dev->dma_mask = &kdwc3_dma_mask; kdwc->clk = devm_clk_get(kdwc->dev, "usb"); + if (IS_ERR(kdwc->clk)) { + dev_err(kdwc->dev, "unable to get usb clock\n"); + return PTR_ERR(kdwc->clk); + } error = clk_prepare_enable(kdwc->clk); if (error < 0) {