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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 9A811C47083 for ; Mon, 31 May 2021 14:25:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E90961375 for ; Mon, 31 May 2021 14:25:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232323AbhEaO1K (ORCPT ); Mon, 31 May 2021 10:27:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:55412 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232540AbhEaNvv (ORCPT ); Mon, 31 May 2021 09:51:51 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E3A5C616E9; Mon, 31 May 2021 13:32:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622467962; bh=Xdmu0No1qD89vu5RbDro4R5XL0d4XQoB0rtetHFaD4I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JClpubnkwpZu9a8XdEDS/Dk+cQBcP1l3HiVHtFKrRnnh+qARk7mt75GqHbrgXSIvB HwNfWrlZfYblMuU0mEexuTJt7W1P/68wIZ/j/B+HodSiPZsAo9eyn1ryCWp90pKMWG WTgfbi4QrYHjoVSunX6pil09VRCpWvbY6///nF7s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexandru Ardelean , Jonathan Cameron , Alexandru Ardelean , Stable@vger.kernel.org Subject: [PATCH 5.10 065/252] iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers Date: Mon, 31 May 2021 15:12:10 +0200 Message-Id: <20210531130700.196502617@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531130657.971257589@linuxfoundation.org> References: <20210531130657.971257589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jonathan Cameron commit f2a772c51206b0c3f262e4f6a3812c89a650191b upstream. Channel numbering must start at 0 and then not have any holes, or it is possible to overflow the available storage. Note this bug was introduced as part of a fix to ensure we didn't rely on the ordering of child nodes. So we need to support arbitrary ordering but they all need to be there somewhere. Note I hit this when using qemu to test the rest of this series. Arguably this isn't the best fix, but it is probably the most minimal option for backporting etc. Alexandru's sign-off is here because he carried this patch in a larger set that Jonathan then applied. Fixes: d7857e4ee1ba6 ("iio: adc: ad7124: Fix DT channel configuration") Reviewed-by: Alexandru Ardelean Signed-off-by: Jonathan Cameron Signed-off-by: Alexandru Ardelean Cc: Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/ad7124.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -616,6 +616,13 @@ static int ad7124_of_parse_channel_confi if (ret) goto err; + if (channel >= indio_dev->num_channels) { + dev_err(indio_dev->dev.parent, + "Channel index >= number of channels\n"); + ret = -EINVAL; + goto err; + } + ret = of_property_read_u32_array(child, "diff-channels", ain, 2); if (ret)