From owner-dev-commits-src-all@freebsd.org Tue Apr 6 00:38:53 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 2F0915CBD8E; Tue, 6 Apr 2021 00:38:53 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FDpYS4MnTz4TXC; Tue, 6 Apr 2021 00:38:52 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 5736B2243F; Tue, 6 Apr 2021 00:38:52 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 1360cqWg029481; Tue, 6 Apr 2021 00:38:52 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1360cqfL029480; Tue, 6 Apr 2021 00:38:52 GMT (envelope-from git) Date: Tue, 6 Apr 2021 00:38:52 GMT Message-Id: <202104060038.1360cqfL029480@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 7f9867f8c65b - main - linuxkpi: do not destroy/free embedded linux cdevs MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 7f9867f8c65b1b3e590dba4dc432a4bc8cf01f68 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Apr 2021 00:38:53 -0000 The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=7f9867f8c65b1b3e590dba4dc432a4bc8cf01f68 commit 7f9867f8c65b1b3e590dba4dc432a4bc8cf01f68 Author: Konstantin Belousov AuthorDate: 2021-03-30 08:44:19 +0000 Commit: Konstantin Belousov CommitDate: 2021-04-06 00:38:29 +0000 linuxkpi: do not destroy/free embedded linux cdevs They have their own lifetime managed by the containing objects. Premature and unexpected free causes corruption. Reviewed by: hselasky Sponsored by: Mellanox Technologies/NVidia Networking MFC after: 1 week --- sys/compat/linuxkpi/common/src/linux_compat.c | 13 ++++++++++--- sys/compat/linuxkpi/common/src/linux_compat.c.orig | 6 +++--- 2 files changed, 13 insertions(+), 6 deletions(-) diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c index 0731859e7a53..71ea7e0844dc 100644 --- a/sys/compat/linuxkpi/common/src/linux_compat.c +++ b/sys/compat/linuxkpi/common/src/linux_compat.c @@ -2199,8 +2199,8 @@ linux_completion_done(struct completion *c) static void linux_cdev_deref(struct linux_cdev *ldev) { - - if (refcount_release(&ldev->refs)) + if (refcount_release(&ldev->refs) && + ldev->kobj.ktype == &linux_cdev_ktype) kfree(ldev); } @@ -2220,12 +2220,17 @@ linux_cdev_release(struct kobject *kobj) static void linux_cdev_static_release(struct kobject *kobj) { + struct cdev *cdev; struct linux_cdev *ldev; struct kobject *parent; ldev = container_of(kobj, struct linux_cdev, kobj); parent = kobj->parent; - linux_destroy_dev(ldev); + cdev = ldev->cdev; + if (cdev != NULL) { + destroy_dev(cdev); + ldev->cdev = NULL; + } kobject_put(parent); } @@ -2237,6 +2242,8 @@ linux_destroy_dev(struct linux_cdev *ldev) return; MPASS((ldev->siref & LDEV_SI_DTR) == 0); + MPASS(ldev->kobj.ktype == &linux_cdev_ktype); + atomic_set_int(&ldev->siref, LDEV_SI_DTR); while ((atomic_load_int(&ldev->siref) & ~LDEV_SI_DTR) != 0) pause("ldevdtr", hz / 4); diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c.orig b/sys/compat/linuxkpi/common/src/linux_compat.c.orig index b7a7ba8b4f18..0731859e7a53 100644 --- a/sys/compat/linuxkpi/common/src/linux_compat.c.orig +++ b/sys/compat/linuxkpi/common/src/linux_compat.c.orig @@ -2220,12 +2220,12 @@ linux_cdev_release(struct kobject *kobj) static void linux_cdev_static_release(struct kobject *kobj) { - struct linux_cdev *cdev; + struct linux_cdev *ldev; struct kobject *parent; - cdev = container_of(kobj, struct linux_cdev, kobj); + ldev = container_of(kobj, struct linux_cdev, kobj); parent = kobj->parent; - linux_destroy_dev(cdev); + linux_destroy_dev(ldev); kobject_put(parent); }