From owner-dev-commits-src-main@freebsd.org Wed Feb 10 15:24:45 2021 Return-Path: Delivered-To: dev-commits-src-main@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 56459549D16; Wed, 10 Feb 2021 15:24:45 +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 4DbNq120gHz4btk; Wed, 10 Feb 2021 15:24:45 +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 3776720120; Wed, 10 Feb 2021 15:24:45 +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 11AFOjVA032248; Wed, 10 Feb 2021 15:24:45 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 11AFOjsm032247; Wed, 10 Feb 2021 15:24:45 GMT (envelope-from git) Date: Wed, 10 Feb 2021 15:24:45 GMT Message-Id: <202102101524.11AFOjsm032247@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Alex Richardson Subject: git: 12ad8bdb34aa - main - usr.sbin/makefs: fix use-after-free in read_mtree_keywords() MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: arichardson X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 12ad8bdb34aa990bcc4f3faa92a6e0557385d2b2 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Feb 2021 15:24:45 -0000 The branch main has been updated by arichardson: URL: https://cgit.FreeBSD.org/src/commit/?id=12ad8bdb34aa990bcc4f3faa92a6e0557385d2b2 commit 12ad8bdb34aa990bcc4f3faa92a6e0557385d2b2 Author: Alex Richardson AuthorDate: 2021-02-10 15:23:23 +0000 Commit: Alex Richardson CommitDate: 2021-02-10 15:24:25 +0000 usr.sbin/makefs: fix use-after-free in read_mtree_keywords() The st variable is used as a shortcut for &node->inode->st, but in one branch just before the exit we update node->inode without changing st. Reported by: AddressSanitizer Reviewed By: emaste MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D28570 --- usr.sbin/makefs/mtree.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/usr.sbin/makefs/mtree.c b/usr.sbin/makefs/mtree.c index 63b52193b872..266315466900 100644 --- a/usr.sbin/makefs/mtree.c +++ b/usr.sbin/makefs/mtree.c @@ -783,6 +783,8 @@ read_mtree_keywords(FILE *fp, fsnode *node) free(node->inode); node->inode = curino; node->inode->nlink++; + /* Reset st since node->inode has been updated. */ + st = &node->inode->st; } }