From patchwork Tue Oct 27 13:49:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 289702 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 A420DC55179 for ; Tue, 27 Oct 2020 15:32:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5C16B22264 for ; Tue, 27 Oct 2020 15:32:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603812722; bh=xnSXTGQeoqiqcMyGRm/u/OjKp+OcsyruOhk6ahlVGgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lqphVsCO3GOmjDmUpuNgcrbtLcCqkxvOC5gHI7Zw0veUdrenbM1ZlW6a8wBZ+yPQK RFSPgWLcMWHR1ntIBfzHlGRUJRGLms5e2odyvKk3Tlr3lL1o7pvQg6YiUbo4gKuX7/ dtNhVxQ2r5aSi22hz9ecuwthHn4OMBhNWvb1YwZc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1799539AbgJ0PcB (ORCPT ); Tue, 27 Oct 2020 11:32:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:49006 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1799531AbgJ0Pb6 (ORCPT ); Tue, 27 Oct 2020 11:31:58 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ABD5A20728; Tue, 27 Oct 2020 15:31:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603812718; bh=xnSXTGQeoqiqcMyGRm/u/OjKp+OcsyruOhk6ahlVGgA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=07fqauwMokOrCr+d+wRiNEF0rewnI6puiucuabQaIxgmMrdda6oMi/ZONIbHXsb97 WYn4ZTwtVbh7bLJbInStT7/OFlwaW8G1A951BOikK149ubk5eolr97GIJDXMhjRGxU 60FrhEMBtrMFBIleLWC0BbU+CELcHJPGDftc9fAc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vladimir Murzin , Andy Shevchenko , Peter Ujfalusi , Vinod Koul , Sasha Levin Subject: [PATCH 5.9 305/757] dmaengine: dmatest: Check list for emptiness before access its last entry Date: Tue, 27 Oct 2020 14:49:15 +0100 Message-Id: <20201027135504.869250668@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135450.497324313@linuxfoundation.org> References: <20201027135450.497324313@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andy Shevchenko [ Upstream commit b28de385b71abf31ce68ec0387638bee26ae9024 ] After writing a garbage to the channel we get an Oops in dmatest_chan_set() due to access to last entry in the empty list. [ 212.670672] BUG: unable to handle page fault for address: fffffff000000020 [ 212.677562] #PF: supervisor read access in kernel mode [ 212.682702] #PF: error_code(0x0000) - not-present page ... [ 212.710074] RIP: 0010:dmatest_chan_set+0x149/0x2d0 [dmatest] [ 212.715739] Code: e8 cc f9 ff ff 48 8b 1d 0d 55 00 00 48 83 7b 10 00 0f 84 63 01 00 00 48 c7 c7 d0 65 4d c0 e8 ee 4a f5 e1 48 89 c6 48 8b 43 10 <48> 8b 40 20 48 8b 78 58 48 85 ff 0f 84 f5 00 00 00 e8 b1 41 f5 e1 Fix this by checking list for emptiness before accessing its last entry. Fixes: d53513d5dc28 ("dmaengine: dmatest: Add support for multi channel testing") Cc: Vladimir Murzin Signed-off-by: Andy Shevchenko Tested-by: Peter Ujfalusi Link: https://lore.kernel.org/r/20200922115847.30100-2-andriy.shevchenko@linux.intel.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/dmatest.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index a819611b8892c..146c3f39f576b 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -1249,15 +1249,14 @@ static int dmatest_chan_set(const char *val, const struct kernel_param *kp) add_threaded_test(info); /* Check if channel was added successfully */ - dtc = list_last_entry(&info->channels, struct dmatest_chan, node); - - if (dtc->chan) { + if (!list_empty(&info->channels)) { /* * if new channel was not successfully added, revert the * "test_channel" string to the name of the last successfully * added channel. exception for when users issues empty string * to channel parameter. */ + dtc = list_last_entry(&info->channels, struct dmatest_chan, node); if ((strcmp(dma_chan_name(dtc->chan), strim(test_channel)) != 0) && (strcmp("", strim(test_channel)) != 0)) { ret = -EINVAL;