From patchwork Sun Feb 27 13:53:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 12761743 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 18B77C433EF for ; Sun, 27 Feb 2022 13:53:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230322AbiB0NyX (ORCPT ); Sun, 27 Feb 2022 08:54:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41814 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231274AbiB0NyW (ORCPT ); Sun, 27 Feb 2022 08:54:22 -0500 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7BC9213FB3 for ; Sun, 27 Feb 2022 05:53:44 -0800 (PST) Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id 4896B3FCAC for ; Sun, 27 Feb 2022 13:53:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1645970023; bh=bTICqCcdg5iJm3vxMOdY/WqtQRYU17qjxPM4LOVV5J8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=OujEerHnWCyDF7cX/5yrId98GeNHZv6gI/sMQgiLTHqu3Xyf3zeWSQlAsxqcIct76 jTG9GLXvjGvC2q4u+V4SVU0sFdMEQFS8eLVMHcfpIGnghkvjv5ddNJnLZAplIQgi2A yUPy4oJx88orAcm2PXKireQSd6p+jeQcYienaUHwoqGGJBzy9zqiq15P5mF6g9JF2H GYzhZk0H71pKDYwefwaC/XigcK4ioSk5+CMWTHdS3EWna7oikSNQMja6yF2Y8HTsVm HwMYJBCEBonvYC32SPhDqz/OepkxOoD9kMw7EnBYvSmdGuZctrxQU7ofntx539nxAY If6DCZRiLv0cA== Received: by mail-ed1-f71.google.com with SMTP id y13-20020aa7c24d000000b00411925b7829so4224676edo.22 for ; Sun, 27 Feb 2022 05:53:43 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=bTICqCcdg5iJm3vxMOdY/WqtQRYU17qjxPM4LOVV5J8=; b=cIeQ0Di3D3HOXmn4B7abXuwnxStiQHKPAD7G+5zLRWFOyPVZDb732ZWpIdQwBkeES/ QqhnG9YC1bFsSOSJvGzWkQndWPaYaALRkcu6Pci6RG5XNJMBzg/HRJjnobW/kWO/iU7B gx0QQrPGQl0RhSQg/+DsPppKLN7HUK9b19zWfej/e6RfH6+ZDTrgE7831111HjozDfOv 9F5iH9ImtYLAiD1aiLm8JrJUNnYX9c92YpMSfcUIXU5rdjyH7CAqtFWQtocO4hv/WX0Q V7CwP9qEz1LbzXJCLFIfxl6uep1Bd3uc2KhAJpNYejmsCGt49UGVykoGOOV126+O/em6 uMFg== X-Gm-Message-State: AOAM532/aYvAM1hgGLCNzMj9GwM/q/07i0ktRdAuZDUikQyQjR5gEGR/ oCC8KiElWz/7n4dX3X6Yq7f2BVAKHE3sWKCDAZ/djLUNZKRd2iJnpKSxcv0lCRhVEvVsQl4aGB7 XfxhIpL513TrWw+cKKD4cSv1K/YQUMpCmr00UnKdGsHig+RM= X-Received: by 2002:a17:906:d8dc:b0:6cf:d1d1:db25 with SMTP id re28-20020a170906d8dc00b006cfd1d1db25mr12142687ejb.285.1645970022944; Sun, 27 Feb 2022 05:53:42 -0800 (PST) X-Google-Smtp-Source: ABdhPJz4Gr3vRsze+QL2k9V58vZ4m4XpaQX7XqFritsjERMdwp7sW6hZpumhsWI+pYV6E4okAkDSDg== X-Received: by 2002:a17:906:d8dc:b0:6cf:d1d1:db25 with SMTP id re28-20020a170906d8dc00b006cfd1d1db25mr12142671ejb.285.1645970022727; Sun, 27 Feb 2022 05:53:42 -0800 (PST) Received: from localhost.localdomain (xdsl-188-155-181-108.adslplus.ch. [188.155.181.108]) by smtp.gmail.com with ESMTPSA id w11-20020a056402128b00b00412ec3f5f74sm4600760edv.62.2022.02.27.05.53.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Feb 2022 05:53:42 -0800 (PST) From: Krzysztof Kozlowski To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Stuart Yoder , Laurentiu Tudor , Abel Vesa , Shawn Guo , Sascha Hauer , Fabio Estevam , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Helgaas , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Gross , Srinivas Kandagatla , Mark Brown , "Michael S. Tsirkin" , Jason Wang , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, NXP Linux Team , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-spi@vger.kernel.org, virtualization@lists.linux-foundation.org, Linus Torvalds Cc: Rasmus Villemoes , Krzysztof Kozlowski , stable@vger.kernel.org Subject: [PATCH v3 11/11] rpmsg: Fix kfree() of static memory on setting driver_override Date: Sun, 27 Feb 2022 14:53:29 +0100 Message-Id: <20220227135329.145862-5-krzysztof.kozlowski@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220227135214.145599-1-krzysztof.kozlowski@canonical.com> References: <20220227135214.145599-1-krzysztof.kozlowski@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org The driver_override field from platform driver should not be initialized from static memory (string literal) because the core later kfree() it, for example when driver_override is set via sysfs. Use dedicated helper to set driver_override properly. Fixes: 950a7388f02b ("rpmsg: Turn name service into a stand alone driver") Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface") Cc: Signed-off-by: Krzysztof Kozlowski Reviewed-by: Bjorn Andersson --- drivers/rpmsg/rpmsg_core.c | 3 ++- drivers/rpmsg/rpmsg_internal.h | 13 +++++++++++-- drivers/rpmsg/rpmsg_ns.c | 14 ++++++++++++-- include/linux/rpmsg.h | 6 ++++-- 4 files changed, 29 insertions(+), 7 deletions(-) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index d9e612f4f0f2..6e2bf2742973 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -397,7 +397,8 @@ field##_store(struct device *dev, struct device_attribute *attr, \ const char *buf, size_t sz) \ { \ struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ - char *new, *old; \ + const char *old; \ + char *new; \ \ new = kstrndup(buf, sz, GFP_KERNEL); \ if (!new) \ diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h index b1245d3ed7c6..31345d6e9a7e 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -92,10 +92,19 @@ int rpmsg_release_channel(struct rpmsg_device *rpdev, */ static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev) { + int ret; + strcpy(rpdev->id.name, "rpmsg_chrdev"); - rpdev->driver_override = "rpmsg_chrdev"; + ret = driver_set_override(&rpdev->dev, &rpdev->driver_override, + "rpmsg_chrdev", strlen("rpmsg_chrdev")); + if (ret) + return ret; + + ret = rpmsg_register_device(rpdev); + if (ret) + kfree(rpdev->driver_override); - return rpmsg_register_device(rpdev); + return ret; } #endif diff --git a/drivers/rpmsg/rpmsg_ns.c b/drivers/rpmsg/rpmsg_ns.c index 762ff1ae279f..95a51543f5ad 100644 --- a/drivers/rpmsg/rpmsg_ns.c +++ b/drivers/rpmsg/rpmsg_ns.c @@ -20,12 +20,22 @@ */ int rpmsg_ns_register_device(struct rpmsg_device *rpdev) { + int ret; + strcpy(rpdev->id.name, "rpmsg_ns"); - rpdev->driver_override = "rpmsg_ns"; + ret = driver_set_override(&rpdev->dev, &rpdev->driver_override, + "rpmsg_ns", strlen("rpmsg_ns")); + if (ret) + return ret; + rpdev->src = RPMSG_NS_ADDR; rpdev->dst = RPMSG_NS_ADDR; - return rpmsg_register_device(rpdev); + ret = rpmsg_register_device(rpdev); + if (ret) + kfree(rpdev->driver_override); + + return ret; } EXPORT_SYMBOL(rpmsg_ns_register_device); diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index 02fa9116cd60..20c8cd1cde21 100644 --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -41,7 +41,9 @@ struct rpmsg_channel_info { * rpmsg_device - device that belong to the rpmsg bus * @dev: the device struct * @id: device id (used to match between rpmsg drivers and devices) - * @driver_override: driver name to force a match + * @driver_override: driver name to force a match; do not set directly, + * because core frees it; use driver_set_override() to + * set or clear it. * @src: local address * @dst: destination address * @ept: the rpmsg endpoint of this channel @@ -51,7 +53,7 @@ struct rpmsg_channel_info { struct rpmsg_device { struct device dev; struct rpmsg_device_id id; - char *driver_override; + const char *driver_override; u32 src; u32 dst; struct rpmsg_endpoint *ept;