From patchwork Tue Sep 21 11:00:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 12507599 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 3A7A0C433EF for ; Tue, 21 Sep 2021 11:00:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2094E61178 for ; Tue, 21 Sep 2021 11:00:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232259AbhIULCE (ORCPT ); Tue, 21 Sep 2021 07:02:04 -0400 Received: from muru.com ([72.249.23.125]:35624 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232249AbhIULCD (ORCPT ); Tue, 21 Sep 2021 07:02:03 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id CB6A38127; Tue, 21 Sep 2021 11:01:01 +0000 (UTC) From: Tony Lindgren To: Ulf Hansson Cc: Adrian Hunter , Chunyan Zhang , Faiz Abbas , Kishon Vijay Abraham I , Santosh Shilimkar , linux-mmc@vger.kernel.org, linux-omap@vger.kernel.org Subject: [PATCH 1/5] mmc: sdhci-omap: Fix NULL pointer exception if regulator is not configured Date: Tue, 21 Sep 2021 14:00:25 +0300 Message-Id: <20210921110029.21944-2-tony@atomide.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921110029.21944-1-tony@atomide.com> References: <20210921110029.21944-1-tony@atomide.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org If sdhci-omap is configured for an unused device instance and the device is not set as disabled, we can get a NULL pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 00000045 ... (regulator_set_voltage) from [] (mmc_regulator_set_ocr+0x44/0xd0) (mmc_regulator_set_ocr) from [] (sdhci_set_ios+0xa4/0x490) (sdhci_set_ios) from [] (sdhci_omap_set_ios+0x124/0x160) (sdhci_omap_set_ios) from [] (mmc_power_up.part.0+0x3c/0x154) (mmc_power_up.part.0) from [] (mmc_start_host+0x88/0x9c) (mmc_start_host) from [] (mmc_add_host+0x58/0x7c) (mmc_add_host) from [] (__sdhci_add_host+0xf0/0x22c) (__sdhci_add_host) from [] (sdhci_omap_probe+0x318/0x72c) (sdhci_omap_probe) from [] (platform_probe+0x58/0xb8) AFAIK we are not seeing this with the devices configured in the mainline kernel but this can cause issues for folks bringing up their boards. Fixes: 7d326930d352 ("mmc: sdhci-omap: Add OMAP SDHCI driver") Signed-off-by: Tony Lindgren --- drivers/mmc/host/sdhci-omap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -682,7 +682,8 @@ static void sdhci_omap_set_power(struct sdhci_host *host, unsigned char mode, { struct mmc_host *mmc = host->mmc; - mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); + if (!IS_ERR(mmc->supply.vmmc)) + mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); } static int sdhci_omap_enable_dma(struct sdhci_host *host)