From patchwork Mon Sep 8 08:42:49 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 4860591 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 05EF49F32E for ; Mon, 8 Sep 2014 08:44:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EF4432011E for ; Mon, 8 Sep 2014 08:44:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 92AF0200F4 for ; Mon, 8 Sep 2014 08:44:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753364AbaIHInS (ORCPT ); Mon, 8 Sep 2014 04:43:18 -0400 Received: from mailout3.w1.samsung.com ([210.118.77.13]:29000 "EHLO mailout3.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752989AbaIHInO (ORCPT ); Mon, 8 Sep 2014 04:43:14 -0400 Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NBK00EM5R0QMK50@mailout3.w1.samsung.com>; Mon, 08 Sep 2014 09:46:02 +0100 (BST) X-AuditID: cbfec7f4-b7f156d0000063c7-41-540d6c1f51a1 Received: from eusync1.samsung.com ( [203.254.199.211]) by eucpsbgm1.samsung.com (EUCPMTA) with SMTP id 43.A9.25543.F1C6D045; Mon, 08 Sep 2014 09:43:11 +0100 (BST) Received: from AMDC1943.digital.local ([106.116.151.171]) by eusync1.samsung.com (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0NBK00IE5QVVTY90@eusync1.samsung.com>; Mon, 08 Sep 2014 09:43:11 +0100 (BST) From: Krzysztof Kozlowski To: Dan Williams , Vinod Koul , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Lars-Peter Clausen , Kyungmin Park , Marek Szyprowski , Bartlomiej Zolnierkiewicz , Krzysztof Kozlowski , stable@vger.kernel.org Subject: [PATCH v2 3/4] dmaengine: pl330: Fix NULL pointer dereference on probe failure Date: Mon, 08 Sep 2014 10:42:49 +0200 Message-id: <1410165770-4452-3-git-send-email-k.kozlowski@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1410165770-4452-1-git-send-email-k.kozlowski@samsung.com> References: <1410165770-4452-1-git-send-email-k.kozlowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpgluLIzCtJLcpLzFFi42I5/e/4ZV35HN4Qgz/3NS02zljPajF96gVG i9VT/7JavH5haHG26Q27xZLJ81ktLu+aw2ax9shddosFGx8xWrzs28/iwOWxeM9LJo8lbw6x evRtWcXo8XmTXABLFJdNSmpOZllqkb5dAlfGlVlfmQvuq1Q0PP/K2sA4Sb6LkZNDQsBE4ufj u+wQtpjEhXvr2boYuTiEBJYySrSee8AM4fQxSez9uZ8FpIpNwFhi8/IlYFUiAp2MEh8nn2QF cZgFWpkkJm2czwxSJSwQKbFlwi8mEJtFQFVi5qNmxi5GDg5eATeJ11tYINbJSZw8NpkVxOYU cJdoa1jBCGILAZVcfHySeQIj7wJGhlWMoqmlyQXFSem5hnrFibnFpXnpesn5uZsYIaH2ZQfj 4mNWhxgFOBiVeHgTrvKECLEmlhVX5h5ilOBgVhLhZQjjDRHiTUmsrEotyo8vKs1JLT7EyMTB KdXAGDCF59ihZLXenRxGC5bwGgnzTZGePHvlbTub5Ge3eyWN3v7YFX377LrpPZ5ch148rpAW r5I6LqP5WCNPfN2XG2tlOS733Psixz3dzyxQZNdGprnTFz2p+rukSf2RgoG8Ta4Ru0Va/hp7 84zyp8wckxZcNL+rsGDT8Zqt7Mlajpvv2rYt5Wv8rcRSnJFoqMVcVJwIAPJr7SwTAgAA Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-9.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If dma_async_device_register() returns error and probe should clean up and return error, a NULL pointer exception happens because of dereference of not allocated channel thread: Dmesg log (from early printk): dma-pl330 12680000.pdma: unable to register DMAC DMA pl330_control: removing pch: eeac4000, chan: eeac4014, thread: (null) Unable to handle kernel NULL pointer dereference at virtual address 0000000c pgd = c0004000 [0000000c] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 2 PID: 1 Comm: swapper/0 Not tainted 3.17.0-rc3-next-20140904-00005-g6cc4c1937d90-dirty #427 task: ee80a800 ti: ee888000 task.ti: ee888000 PC is at _stop+0x8/0x2c8 LR is at pl330_control+0x70/0x2e8 pc : [] lr : [] psr: 60000193 sp : ee889df8 ip : 00000002 fp : 00000000 r10: eeac4014 r9 : ee0e62bc r8 : 00000000 r7 : eeac405c r6 : 60000113 r5 : ee0e6210 r4 : eeac4000 r3 : 00000002 r2 : 00000002 r1 : 00010000 r0 : 00000000 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c5387d Table: 4000404a DAC: 00000015 Process swapper/0 (pid: 1, stack limit = 0xee888240) Stack: (0xee889df8 to 0xee88a000) 9de0: 00000002 eeac4000 9e00: ee0e6210 eeac4000 ee0e6210 60000113 eeac405c c020623c 00000000 c020725c 9e20: ee889e20 ee889e20 ee0e6210 eeac4080 00200200 00100100 eeac4014 00000020 9e40: ee0e6218 c0208374 00000000 ee9bb340 ee0e6210 00000000 00000000 c0605cd8 9e60: ee970000 c0605c84 ee9700f8 00000000 c05c4270 00000000 00000000 c0203b3c 9e80: ee970000 c06624a8 00000000 c0605c84 00000000 c023f890 ee970000 c0605c84 9ea0: ee970034 00000000 c05b23d0 c023fa3c 00000000 c0605c84 c023f9b0 c023e0d4 9ec0: ee947e78 ee9b9440 c0605c84 eea1e780 c0605acc c023f094 c0513b50 c0605c84 9ee0: c05ecbd8 c0605c84 c05ecbd8 ee11ba40 c0626500 c0240064 00000000 c05ecbd8 9f00: c05ecbd8 c0008964 c040f13c 0000009f c0626500 c057465c ee80a800 60000113 9f20: 00000000 c05efdb0 60000113 00000000 ef7fc89d c0421168 0000008f c003787c 9f40: c0573d6c 00000006 ef7fc8bb 00000006 c05efd50 ef7fc800 c05dfbc4 00000006 9f60: c05c4264 c0626500 0000008f c05c4270 c059b518 c059bcb4 00000006 00000006 9f80: c059b518 c003c08c 00000000 c040091c 00000000 00000000 00000000 00000000 9fa0: 00000000 c0400924 00000000 c000e7b8 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 c0c0c0c0 c0c0c0c0 [] (_stop) from [] (pl330_control+0x70/0x2e8) [] (pl330_control) from [] (pl330_probe+0x594/0x75c) [] (pl330_probe) from [] (amba_probe+0xb8/0x120) [] (amba_probe) from [] (driver_probe_device+0x10c/0x22c) [] (driver_probe_device) from [] (__driver_attach+0x8c/0x90) [] (__driver_attach) from [] (bus_for_each_dev+0x54/0x88) [] (bus_for_each_dev) from [] (bus_add_driver+0xd4/0x1d0) [] (bus_add_driver) from [] (driver_register+0x78/0xf4) [] (driver_register) from [] (do_one_initcall+0x80/0x1d0) [] (do_one_initcall) from [] (kernel_init_freeable+0x108/0x1d4) [] (kernel_init_freeable) from [] (kernel_init+0x8/0xec) [] (kernel_init) from [] (ret_from_fork+0x14/0x3c) Code: e5813010 e12fff1e e92d40f0 e24dd00c (e590200c) ---[ end trace c94b2f4f38dff3bf ]--- This happens because the necessary resources were not yet allocated - no call to pl330_alloc_chan_resources(). Terminate the thread and free channel resource only if channel thread is not NULL. Signed-off-by: Krzysztof Kozlowski Cc: Fixes: 0b94c5771705 ("DMA: PL330: Add check if device tree compatible") Reviewed-by: Lars-Peter Clausen --- Changes since v1: ================= 1. Add Lars-Peter Clausen's reviewed-by tag. --- drivers/dma/pl330.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 28e3775888a6..4a2caaa0432e 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -2748,8 +2748,10 @@ probe_err3: list_del(&pch->chan.device_node); /* Flush the channel */ - pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0); - pl330_free_chan_resources(&pch->chan); + if (pch->thread) { + pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0); + pl330_free_chan_resources(&pch->chan); + } } probe_err2: pl330_del(pl330);