From owner-svn-src-head@freebsd.org Mon Oct 22 08:58:28 2018 Return-Path: Delivered-To: svn-src-head@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 AD481FEFD97; Mon, 22 Oct 2018 08:58:28 +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 631828F74A; Mon, 22 Oct 2018 08:58:28 +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 5DC7E1A103; Mon, 22 Oct 2018 08:58:28 +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 w9M8wSlG039043; Mon, 22 Oct 2018 08:58:28 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w9M8wSBZ039042; Mon, 22 Oct 2018 08:58:28 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201810220858.w9M8wSBZ039042@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Mon, 22 Oct 2018 08:58:28 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r339582 - head/sys/dev/sound/midi X-SVN-Group: head X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: head/sys/dev/sound/midi X-SVN-Commit-Revision: 339582 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Oct 2018 08:58:28 -0000 Author: hselasky Date: Mon Oct 22 08:58:27 2018 New Revision: 339582 URL: https://svnweb.freebsd.org/changeset/base/339582 Log: 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 MFC after: 3 days Sponsored by: Mellanox Technologies Modified: head/sys/dev/sound/midi/sequencer.c Modified: head/sys/dev/sound/midi/sequencer.c ============================================================================== --- head/sys/dev/sound/midi/sequencer.c Mon Oct 22 08:55:58 2018 (r339581) +++ head/sys/dev/sound/midi/sequencer.c Mon Oct 22 08:58:27 2018 (r339582) @@ -921,7 +921,9 @@ mseq_read(struct cdev *i_dev, struct uio *uio, int iof 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; } @@ -996,7 +998,9 @@ mseq_write(struct cdev *i_dev, struct uio *uio, int io retval = ENXIO; goto err0; } + mtx_unlock(&scp->seq_lock); retval = uiomove(event, used, uio); + mtx_lock(&scp->seq_lock); if (retval) goto err0; @@ -1034,7 +1038,9 @@ mseq_write(struct cdev *i_dev, struct uio *uio, int io 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; @@ -1045,6 +1051,7 @@ mseq_write(struct cdev *i_dev, struct uio *uio, int io } retval = EINVAL; if (ev_code >= 128) { + int error; /* * Some sort of an extended event. The size is eight @@ -1054,7 +1061,13 @@ mseq_write(struct cdev *i_dev, struct uio *uio, int io 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;