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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1ABE7C001E0 for ; Mon, 23 Oct 2023 11:14:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233694AbjJWLOz (ORCPT ); Mon, 23 Oct 2023 07:14:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233699AbjJWLOz (ORCPT ); Mon, 23 Oct 2023 07:14:55 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24889C4 for ; Mon, 23 Oct 2023 04:14:53 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D1F4C433CA; Mon, 23 Oct 2023 11:14:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1698059692; bh=um0rTo09nQBOUXHuAPt+uBN/yzpg1eLJuxDpUY5n31k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gdREw3hp3OJhhaqfx3S/Uo0oFjvnlUY3Jy/JJC5l+VTKvro7bs59XYQMEFmZH4LND 3chIZtg1t9UoTtsOFI1vHIaAaKyCxlK4S2kh7q4/2aiaE9FYzwlVJX3nZvO5x5O7HM jGN/XQOa9Uic8KgiVJij/9zQPYElWMn7r4wsCCgM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Amelie Delaunay , Vinod Koul Subject: [PATCH 4.19 20/98] dmaengine: stm32-mdma: abort resume if no ongoing transfer Date: Mon, 23 Oct 2023 12:56:09 +0200 Message-ID: <20231023104814.300890453@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231023104813.580375891@linuxfoundation.org> References: <20231023104813.580375891@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Amelie Delaunay commit 81337b9a72dc58a5fa0ae8a042e8cb59f9bdec4a upstream. chan->desc can be null, if transfer is terminated when resume is called, leading to a NULL pointer when retrieving the hwdesc. To avoid this case, check that chan->desc is not null and channel is disabled (transfer previously paused or terminated). Fixes: a4ffb13c8946 ("dmaengine: Add STM32 MDMA driver") Signed-off-by: Amelie Delaunay Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231004163531.2864160-1-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/stm32-mdma.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -1217,6 +1217,10 @@ static int stm32_mdma_resume(struct dma_ unsigned long flags; u32 status, reg; + /* Transfer can be terminated */ + if (!chan->desc || (stm32_mdma_read(dmadev, STM32_MDMA_CCR(chan->id)) & STM32_MDMA_CCR_EN)) + return -EPERM; + hwdesc = chan->desc->node[chan->curr_hwdesc].hwdesc; spin_lock_irqsave(&chan->vchan.lock, flags);