From owner-svn-src-all@freebsd.org Thu Oct 25 15:02:07 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id ABC071079F19; Thu, 25 Oct 2018 15:02:07 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5EABA87503; Thu, 25 Oct 2018 15:02:07 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3F8A113618; Thu, 25 Oct 2018 15:02:07 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w9PF27nE062991; Thu, 25 Oct 2018 15:02:07 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w9PF27ZW062990; Thu, 25 Oct 2018 15:02:07 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201810251502.w9PF27ZW062990@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Thu, 25 Oct 2018 15:02:07 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r339723 - stable/8/sys/dev/sound/midi X-SVN-Group: stable-8 X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: stable/8/sys/dev/sound/midi X-SVN-Commit-Revision: 339723 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Oct 2018 15:02:08 -0000 Author: hselasky Date: Thu Oct 25 15:02:06 2018 New Revision: 339723 URL: https://svnweb.freebsd.org/changeset/base/339723 Log: MFC r339582: Drop sequencer mutex around uiomove() and make sure we don't move more bytes than is available, else a panic might happen. Found by: Peter Holm Sponsored by: Mellanox Technologies Modified: stable/8/sys/dev/sound/midi/sequencer.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/dev/ (props changed) stable/8/sys/dev/sound/ (props changed) stable/8/sys/dev/sound/midi/ (props changed) Modified: stable/8/sys/dev/sound/midi/sequencer.c ============================================================================== --- stable/8/sys/dev/sound/midi/sequencer.c Thu Oct 25 14:57:33 2018 (r339722) +++ stable/8/sys/dev/sound/midi/sequencer.c Thu Oct 25 15:02:06 2018 (r339723) @@ -928,7 +928,9 @@ seq_read(struct cdev *i_dev, struct uio *uio, int iofl SEQ_DEBUG(8, printf("midiread: uiomove cc=%d\n", used)); MIDIQ_DEQ(scp->in_q, buf, used); + mtx_unlock(&scp->seq_lock); retval = uiomove(buf, used, uio); + mtx_lock(&scp->seq_lock); if (retval) goto err1; } @@ -1003,7 +1005,9 @@ seq_write(struct cdev *i_dev, struct uio *uio, int iof retval = ENXIO; goto err0; } + mtx_unlock(&scp->seq_lock); retval = uiomove(event, used, uio); + mtx_lock(&scp->seq_lock); if (retval) goto err0; @@ -1041,7 +1045,9 @@ seq_write(struct cdev *i_dev, struct uio *uio, int iof SEQ_DEBUG(2, printf("seq_write: SEQ_FULLSIZE flusing buffer.\n")); while (uio->uio_resid > 0) { - retval = uiomove(event, EV_SZ, uio); + mtx_unlock(&scp->seq_lock); + retval = uiomove(event, MIN(EV_SZ, uio->uio_resid), uio); + mtx_lock(&scp->seq_lock); if (retval) goto err0; @@ -1052,6 +1058,7 @@ seq_write(struct cdev *i_dev, struct uio *uio, int iof } retval = EINVAL; if (ev_code >= 128) { + int error; /* * Some sort of an extended event. The size is eight @@ -1061,7 +1068,13 @@ seq_write(struct cdev *i_dev, struct uio *uio, int iof SEQ_DEBUG(2, printf("seq_write: invalid level two event %x.\n", ev_code)); goto err0; } - if (uiomove((caddr_t)&event[4], 4, uio)) { + mtx_unlock(&scp->seq_lock); + if (uio->uio_resid < 4) + error = EINVAL; + else + error = uiomove((caddr_t)&event[4], 4, uio); + mtx_lock(&scp->seq_lock); + if (error) { SEQ_DEBUG(2, printf("seq_write: user memory mangled?\n")); goto err0;