From patchwork Mon Mar 15 13:55:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401124 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 B8380C433DB for ; Mon, 15 Mar 2021 14:25:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9351E65070 for ; Mon, 15 Mar 2021 14:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235646AbhCOOI6 (ORCPT ); Mon, 15 Mar 2021 10:08:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:49602 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234323AbhCOODO (ORCPT ); Mon, 15 Mar 2021 10:03:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AA33764E83; Mon, 15 Mar 2021 14:03:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816993; bh=pWVrf9WJrCrW6pcncVZT4ohTEHF2z1MMs/CPqbxUEps=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kTTlY/hx08SWdKpb7XMEjZchyyMEUYaxdjbyxAm7H2BFC7dAXwzLat7iaoI/JEJtH /VgW4MgyWt4AIjhERDNMWC5HWK8s8qC11Kcf8uzJSeMcc0ADJLYXWwpNMULq/AHMb1 x/3aqLdhloBJLo6EGdKTAmRRhIeIJtDpNGwLIf1I= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ian Abbott Subject: [PATCH 5.10 235/290] staging: comedi: das6402: Fix endian problem for AI command data Date: Mon, 15 Mar 2021 14:55:28 +0100 Message-Id: <20210315135549.926201910@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135541.921894249@linuxfoundation.org> References: <20210315135541.921894249@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 1c0f20b78781b9ca50dc3ecfd396d0db5b141890 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`. Fixes: d1d24cb65ee3 ("staging: comedi: das6402: read analog input samples in interrupt handler") Cc: # 3.19+ Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20210223143055.257402-5-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/das6402.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/staging/comedi/drivers/das6402.c +++ b/drivers/staging/comedi/drivers/das6402.c @@ -186,7 +186,7 @@ static irqreturn_t das6402_interrupt(int if (status & DAS6402_STATUS_FFULL) { async->events |= COMEDI_CB_OVERFLOW; } else if (status & DAS6402_STATUS_FFNE) { - unsigned int val; + unsigned short val; val = das6402_ai_read_sample(dev, s); comedi_buf_write_samples(s, &val, 1);