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 X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 BCD37C433B4 for ; Fri, 7 May 2021 13:54:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F0996141E for ; Fri, 7 May 2021 13:54:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234529AbhEGNzu (ORCPT ); Fri, 7 May 2021 09:55:50 -0400 Received: from forward5-smtp.messagingengine.com ([66.111.4.239]:56373 "EHLO forward5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234081AbhEGNzu (ORCPT ); Fri, 7 May 2021 09:55:50 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailforward.nyi.internal (Postfix) with ESMTP id 0F9B7194156C; Fri, 7 May 2021 09:54:50 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute4.internal (MEProxy); Fri, 07 May 2021 09:54:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=Q0ESpJ k1E7cia+7Rp/4fLBHabtYFoN9Q5GXvqzcIcx8=; b=hcnZ6nvlKipuRhtBPxh0dE 5rPrIkq1+yfkCgWJvrIciXMpnD9DKRY+gCcuxToVX6ElU26isC530wdWGpRFP/QY dpoCT8x4g7ilVYvNzc+ur4wZP7fdDu/2z2IyJIhGtYE8aJXrLQUr0ybp4In32LMM KgN1a1ZDGqi6c6oBSpF5Xn3H9LOmp5QuM5Zeqjhpie3fifbBYVC6F17u486Rw+97 lxM1SbV0ajxXWn1Kx8wfEndFyVqFgBSLKjg+g8JjMZo64mvnu2fmcWtMVTLPuUdX 7Cd0i04cavIeMxyw5xpklSDGIOPEqboInEGBG0RYVAB7BueHqQybM+WND5bMWhNw == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrvdegvddgjedtucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucgfrhhlucfvnfffucdluddtmdenucfjughrpefuvf fhfffkgggtgfesthekredttddtlfenucfhrhhomhepoehgrhgvghhkhheslhhinhhugihf ohhunhgurghtihhonhdrohhrgheqnecuggftrfgrthhtvghrnhepleelledvgeefleeltd etgedugeffgffhudffuddukeegfeelgeeigeekjefhleevnecuffhomhgrihhnpehkvghr nhgvlhdrohhrghenucfkphepkeefrdekiedrjeegrdeigeenucevlhhushhtvghrufhiii gvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpehgrhgvgheskhhrohgrhhdrtghomh X-ME-Proxy: Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 7 May 2021 09:54:48 -0400 (EDT) Subject: FAILED: patch "[PATCH] mtd: spi-nor: core: Fix an issue of releasing resources" failed to apply to 4.14-stable tree To: chenxiang66@hisilicon.com, michael@walle.cc, tudor.ambarus@microchip.com, yangyicong@hisilicon.com Cc: From: Date: Fri, 07 May 2021 15:54:46 +0200 Message-ID: <162039568612311@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From be94215be1ab19e5d38f50962f611c88d4bfc83a Mon Sep 17 00:00:00 2001 From: Xiang Chen Date: Thu, 1 Apr 2021 15:34:46 +0800 Subject: [PATCH] mtd: spi-nor: core: Fix an issue of releasing resources during read/write If rmmod the driver during read or write, the driver will release the resources which are used during read or write, so it is possible to refer to NULL pointer. Use the testcase "mtd_debug read /dev/mtd0 0xc00000 0x400000 dest_file & sleep 0.5;rmmod spi_hisi_sfc_v3xx.ko", the issue can be reproduced in hisi_sfc_v3xx driver. To avoid the issue, fill the interface _get_device and _put_device of mtd_info to grab the reference to the spi controller driver module, so the request of rmmod the driver is rejected before read/write is finished. Fixes: b199489d37b2 ("mtd: spi-nor: add the framework for SPI NOR") Signed-off-by: Xiang Chen Signed-off-by: Yicong Yang Signed-off-by: Tudor Ambarus Tested-by: Michael Walle Tested-by: Tudor Ambarus Reviewed-by: Michael Walle Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1617262486-4223-1-git-send-email-yangyicong@hisilicon.com diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 8cf3cf92129e..bd2c7717eb10 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -2905,6 +2905,37 @@ static void spi_nor_resume(struct mtd_info *mtd) dev_err(dev, "resume() failed\n"); } +static int spi_nor_get_device(struct mtd_info *mtd) +{ + struct mtd_info *master = mtd_get_master(mtd); + struct spi_nor *nor = mtd_to_spi_nor(master); + struct device *dev; + + if (nor->spimem) + dev = nor->spimem->spi->controller->dev.parent; + else + dev = nor->dev; + + if (!try_module_get(dev->driver->owner)) + return -ENODEV; + + return 0; +} + +static void spi_nor_put_device(struct mtd_info *mtd) +{ + struct mtd_info *master = mtd_get_master(mtd); + struct spi_nor *nor = mtd_to_spi_nor(master); + struct device *dev; + + if (nor->spimem) + dev = nor->spimem->spi->controller->dev.parent; + else + dev = nor->dev; + + module_put(dev->driver->owner); +} + void spi_nor_restore(struct spi_nor *nor) { /* restore the addressing mode */ @@ -3099,6 +3130,8 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, mtd->_read = spi_nor_read; mtd->_suspend = spi_nor_suspend; mtd->_resume = spi_nor_resume; + mtd->_get_device = spi_nor_get_device; + mtd->_put_device = spi_nor_put_device; if (info->flags & USE_FSR) nor->flags |= SNOR_F_USE_FSR;