From nobody Sat Nov 6 14:02:20 2021 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 6F4641843F58; Sat, 6 Nov 2021 14:02:21 +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 4HmfFn0SJWz3KHq; Sat, 6 Nov 2021 14:02:20 +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 95E3A4657; Sat, 6 Nov 2021 14:02:20 +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 1A6E2KWw023370; Sat, 6 Nov 2021 14:02:20 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1A6E2KcX023358; Sat, 6 Nov 2021 14:02:20 GMT (envelope-from git) Date: Sat, 6 Nov 2021 14:02:20 GMT Message-Id: <202111061402.1A6E2KcX023358@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: "Jason A. Harmening" Subject: git: fb273fe70f8b - main - unionfs: replace zero-length read check with KASSERT List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: jah X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: fb273fe70f8be66bb946c5a2ea1e53042bbada48 Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by jah: URL: https://cgit.FreeBSD.org/src/commit/?id=fb273fe70f8be66bb946c5a2ea1e53042bbada48 commit fb273fe70f8be66bb946c5a2ea1e53042bbada48 Author: Jason A. Harmening AuthorDate: 2021-10-28 05:31:52 +0000 Commit: Jason A. Harmening CommitDate: 2021-11-06 14:08:34 +0000 unionfs: replace zero-length read check with KASSERT The lower FS VOP_READDIR() shouldn't return an empty read without setting EOF; don't try to handle this case only for non-DIAGNOSTIC builds. Noted by: kib Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D32629 --- sys/fs/unionfs/union_subr.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/sys/fs/unionfs/union_subr.c b/sys/fs/unionfs/union_subr.c index 0ca209c47502..8269b1e11fa4 100644 --- a/sys/fs/unionfs/union_subr.c +++ b/sys/fs/unionfs/union_subr.c @@ -1251,13 +1251,8 @@ unionfs_check_rmdir(struct vnode *vp, struct ucred *cred, struct thread *td) error = VOP_READDIR(lvp, &uio, cred, &eofflag, NULL, NULL); if (error != 0) break; - if (eofflag == 0 && uio.uio_resid == sizeof(buf)) { -#ifdef DIAGNOSTIC - panic("%s: bad readdir response from lower FS", - __func__); -#endif - break; - } + KASSERT(eofflag != 0 || uio.uio_resid < sizeof(buf), + ("%s: empty read from lower FS", __func__)); edp = (struct dirent*)&buf[sizeof(buf) - uio.uio_resid]; for (dp = (struct dirent*)buf; !error && dp < edp;