From owner-dev-commits-src-all@freebsd.org Mon Mar 1 14:32:14 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 8716455F165; Mon, 1 Mar 2021 14:32:14 +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 4Dq2lf3T0pz4cj1; Mon, 1 Mar 2021 14:32:14 +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 6AAC925399; Mon, 1 Mar 2021 14:32:14 +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 121EWEdN078980; Mon, 1 Mar 2021 14:32:14 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 121EWEYJ078979; Mon, 1 Mar 2021 14:32:14 GMT (envelope-from git) Date: Mon, 1 Mar 2021 14:32:14 GMT Message-Id: <202103011432.121EWEYJ078979@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Rick Macklem Subject: git: a5f9fe2bab78 - main - copy_file_range(2): Fix for small values of input file offset and len MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: rmacklem X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: a5f9fe2bab789f49e8b53da3a62dbd34725e23ea 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: Mon, 01 Mar 2021 14:32:14 -0000 The branch main has been updated by rmacklem: URL: https://cgit.FreeBSD.org/src/commit/?id=a5f9fe2bab789f49e8b53da3a62dbd34725e23ea commit a5f9fe2bab789f49e8b53da3a62dbd34725e23ea Author: Rick Macklem AuthorDate: 2021-03-01 14:28:30 +0000 Commit: Rick Macklem CommitDate: 2021-03-01 14:31:10 +0000 copy_file_range(2): Fix for small values of input file offset and len r366302 broke copy_file_range(2) for small values of input file offset and len. It was possible for rem to be greater than len and then "len - rem" was a large value, since both variables are unsigned. Reported by: koobs, Pablo (Python) Reviewed by: asomers, koobs MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D28981 --- sys/kern/vfs_vnops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index 781968f2db53..7a0951fb07ca 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -3143,7 +3143,7 @@ vn_generic_copy_file_range(struct vnode *invp, off_t *inoffp, rem = *inoffp % blksize; if (rem > 0) rem = blksize - rem; - if (len - rem > blksize) + if (len > rem && len - rem > blksize) len = savlen = rounddown(len - rem, blksize) + rem; }