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Date:      Tue, 24 Aug 2021 18:29:49 GMT
From:      Gordon Tetlow <gordon@FreeBSD.org>
To:        src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org
Subject:   git: a7db88b5db58 - releng/11.4 - Fix missing error handling in bhyve(8) device models.
Message-ID:  <202108241829.17OITnXM024543@gitrepo.freebsd.org>
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The branch releng/11.4 has been updated by gordon:

URL: https://cgit.FreeBSD.org/src/commit/?id=a7db88b5db5817a806a38800c615b7755a3e6b34

commit a7db88b5db5817a806a38800c615b7755a3e6b34
Author:     Gordon Tetlow <gordon@FreeBSD.org>
AuthorDate: 2021-08-24 17:34:59 +0000
Commit:     Gordon Tetlow <gordon@FreeBSD.org>
CommitDate: 2021-08-24 17:34:59 +0000

    Fix missing error handling in bhyve(8) device models.
    
    Approved by:    so
    Security:       SA-21:13.bhyve
    Security:       CVE-2021-29631
---
 usr.sbin/bhyve/pci_virtio_console.c | 7 ++++---
 usr.sbin/bhyve/pci_virtio_rnd.c     | 5 +++--
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/usr.sbin/bhyve/pci_virtio_console.c b/usr.sbin/bhyve/pci_virtio_console.c
index 13aa4ad30cca..73528a2e1476 100644
--- a/usr.sbin/bhyve/pci_virtio_console.c
+++ b/usr.sbin/bhyve/pci_virtio_console.c
@@ -404,6 +404,7 @@ pci_vtcon_sock_rx(int fd __unused, enum ev_type t __unused, void *arg)
 
 	do {
 		n = vq_getchain(vq, &idx, &iov, 1, NULL);
+		assert(n == 1);
 		len = readv(sock->vss_conn_fd, &iov, n);
 
 		if (len == 0 || (len < 0 && errno == EWOULDBLOCK)) {
@@ -544,7 +545,6 @@ pci_vtcon_control_send(struct pci_vtcon_softc *sc,
 		return;
 
 	n = vq_getchain(vq, &idx, &iov, 1, NULL);
-
 	assert(n == 1);
 
 	memcpy(iov.iov_base, ctrl, sizeof(struct pci_vtcon_control));
@@ -563,7 +563,8 @@ pci_vtcon_notify_tx(void *vsc, struct vqueue_info *vq)
 	struct pci_vtcon_softc *sc;
 	struct pci_vtcon_port *port;
 	struct iovec iov[1];
-	uint16_t idx, n;
+	int n;
+	uint16_t idx;
 	uint16_t flags[8];
 
 	sc = vsc;
@@ -571,7 +572,7 @@ pci_vtcon_notify_tx(void *vsc, struct vqueue_info *vq)
 
 	while (vq_has_descs(vq)) {
 		n = vq_getchain(vq, &idx, iov, 1, flags);
-		assert(n >= 1);
+		assert(n == 1);
 		if (port != NULL)
 			port->vsp_cb(port, port->vsp_arg, iov, 1);
 
diff --git a/usr.sbin/bhyve/pci_virtio_rnd.c b/usr.sbin/bhyve/pci_virtio_rnd.c
index 44bc55e0039e..5d2fac0c723a 100644
--- a/usr.sbin/bhyve/pci_virtio_rnd.c
+++ b/usr.sbin/bhyve/pci_virtio_rnd.c
@@ -109,7 +109,7 @@ pci_vtrnd_notify(void *vsc, struct vqueue_info *vq)
 {
 	struct iovec iov;
 	struct pci_vtrnd_softc *sc;
-	int len;
+	int len, n;
 	uint16_t idx;
 
 	sc = vsc;
@@ -120,7 +120,8 @@ pci_vtrnd_notify(void *vsc, struct vqueue_info *vq)
 	}
 
 	while (vq_has_descs(vq)) {
-		vq_getchain(vq, &idx, &iov, 1, NULL);
+		n = vq_getchain(vq, &idx, &iov, 1, NULL);
+		assert(n == 1);
 
 		len = read(sc->vrsc_fd, iov.iov_base, iov.iov_len);

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