From patchwork Mon Mar 15 13:57:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401314 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=-19.0 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, 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 AD0F7C468BF for ; Mon, 15 Mar 2021 14:05:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9570B64EF3 for ; Mon, 15 Mar 2021 14:05:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234681AbhCOOEt (ORCPT ); Mon, 15 Mar 2021 10:04:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:35186 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231869AbhCOOAa (ORCPT ); Mon, 15 Mar 2021 10:00:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4FDAB64F26; Mon, 15 Mar 2021 14:00:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816808; bh=s/mm4l2H4hc0b8rNoAhfe6aG3Rn0AIXyOI5yQEuZFqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S4vCiD7iPndoJOp4cdDLCK6/qMKuQuA9IRp4yleMCmKFAyvAJr+BoBccaKFmJooPS B+z2FV2xrQeApIBqxYpLKkMzJJh0h3OhaneXYn+uzB0sMbUzCNQOTpXQeYGvrturtL l6fIjgNPJm0soXO1bCebmDRvw+hmvVSaBy4KCSW4= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ian Abbott Subject: [PATCH 4.14 77/95] staging: comedi: dmm32at: Fix endian problem for AI command data Date: Mon, 15 Mar 2021 14:57:47 +0100 Message-Id: <20210315135742.811767880@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135740.245494252@linuxfoundation.org> References: <20210315135740.245494252@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Ian Abbott commit 54999c0d94b3c26625f896f8e3460bc029821578 upstream. The analog input subdevice supports Comedi asynchronous commands that use Comedi's 16-bit sample format. However, the call to `comedi_buf_write_samples()` is passing the address of a 32-bit integer variable. On bigendian machines, this will copy 2 bytes from the wrong end of the 32-bit value. Fix it by changing the type of the variable holding the sample value to `unsigned short`. [Note: the bug was introduced in commit 1700529b24cc ("staging: comedi: dmm32at: use comedi_buf_write_samples()") but the patch applies better to the later (but in the same kernel release) commit 0c0eadadcbe6e ("staging: comedi: dmm32at: introduce dmm32_ai_get_sample()").] Fixes: 0c0eadadcbe6e ("staging: comedi: dmm32at: introduce dmm32_ai_get_sample()") Cc: # 3.19+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20210223143055.257402-7-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/dmm32at.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/staging/comedi/drivers/dmm32at.c +++ b/drivers/staging/comedi/drivers/dmm32at.c @@ -413,7 +413,7 @@ static irqreturn_t dmm32at_isr(int irq, { struct comedi_device *dev = d; unsigned char intstat; - unsigned int val; + unsigned short val; int i; if (!dev->attached) {