diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
index 100b7171f4e371d1c7235b18385280f7ff9d85f6..6098005cd4bd820be5fa5cb9464027f6a6a058d6 100644
--- a/hw/usb/dev-mtp.c
+++ b/hw/usb/dev-mtp.c
@@ -653,13 +653,18 @@ static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
 {
     struct dirent *entry;
     DIR *dir;
+    int fd;
 
     if (o->have_children) {
         return;
     }
     o->have_children = true;
 
-    dir = opendir(o->path);
+    fd = open(o->path, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);
+    if (fd < 0) {
+        return;
+    }
+    dir = fdopendir(fd);
     if (!dir) {
         return;
     }
@@ -1007,7 +1012,7 @@ static MTPData *usb_mtp_get_object(MTPState *s, MTPControl *c,
 
     trace_usb_mtp_op_get_object(s->dev.addr, o->handle, o->path);
 
-    d->fd = open(o->path, O_RDONLY);
+    d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
     if (d->fd == -1) {
         usb_mtp_data_free(d);
         return NULL;
@@ -1031,7 +1036,7 @@ static MTPData *usb_mtp_get_partial_object(MTPState *s, MTPControl *c,
                                         c->argv[1], c->argv[2]);
 
     d = usb_mtp_data_alloc(c);
-    d->fd = open(o->path, O_RDONLY);
+    d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
     if (d->fd == -1) {
         usb_mtp_data_free(d);
         return NULL;
@@ -1658,7 +1663,7 @@ static void usb_mtp_write_data(MTPState *s)
                                  0, 0, 0, 0);
             goto done;
         }
-        d->fd = open(path, O_CREAT | O_WRONLY, mask);
+        d->fd = open(path, O_CREAT | O_WRONLY | O_CLOEXEC | O_NOFOLLOW, mask);
         if (d->fd == -1) {
             usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
                                  0, 0, 0, 0);
@@ -1705,7 +1710,7 @@ free:
     s->write_pending = false;
 }
 
-static void usb_mtp_write_metadata(MTPState *s)
+static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen)
 {
     MTPData *d = s->data_out;
     ObjectInfo *dataset = (ObjectInfo *)d->data;
@@ -1717,7 +1722,9 @@ static void usb_mtp_write_metadata(MTPState *s)
     assert(!s->write_pending);
     assert(p != NULL);
 
-    filename = utf16_to_str(dataset->length, dataset->filename);
+    filename = utf16_to_str(MIN(dataset->length,
+                                dlen - offsetof(ObjectInfo, filename)),
+                            dataset->filename);
 
     if (strchr(filename, '/')) {
         usb_mtp_queue_result(s, RES_PARAMETER_NOT_SUPPORTED, d->trans,
@@ -1733,7 +1740,6 @@ static void usb_mtp_write_metadata(MTPState *s)
     s->dataset.filename = filename;
     s->dataset.format = dataset->format;
     s->dataset.size = dataset->size;
-    s->dataset.filename = filename;
     s->write_pending = true;
 
     if (s->dataset.format == FMT_ASSOCIATION) {
@@ -1802,7 +1808,7 @@ static void usb_mtp_get_data(MTPState *s, mtp_container *container,
         if (d->offset == d->length) {
             /* The operation might have already failed */
             if (!s->result) {
-                usb_mtp_write_metadata(s);
+                usb_mtp_write_metadata(s, dlen);
             }
             usb_mtp_data_free(s->data_out);
             s->data_out = NULL;
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index e5acfc5ba5543bc609d60a829e6da86780cf609b..8d44d483dfb87b58e3b4de09652d7b1be98ee87c 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1783,9 +1783,17 @@ static int ehci_state_fetchqtd(EHCIQueue *q)
     EHCIqtd qtd;
     EHCIPacket *p;
     int again = 1;
+    uint32_t addr;
 
-    if (get_dwords(q->ehci, NLPTR_GET(q->qtdaddr), (uint32_t *) &qtd,
-                   sizeof(EHCIqtd) >> 2) < 0) {
+    addr = NLPTR_GET(q->qtdaddr);
+    if (get_dwords(q->ehci, addr +  8, &qtd.token,   1) < 0) {
+        return 0;
+    }
+    barrier();
+    if (get_dwords(q->ehci, addr +  0, &qtd.next,    1) < 0 ||
+        get_dwords(q->ehci, addr +  4, &qtd.altnext, 1) < 0 ||
+        get_dwords(q->ehci, addr + 12, qtd.bufptr,
+                   ARRAY_SIZE(qtd.bufptr)) < 0) {
         return 0;
     }
     ehci_trace_qtd(q, NLPTR_GET(q->qtdaddr), &qtd);
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index b6602ded4e1a93e1cb97a62de5fe199b73d9559b..833250a886afb4d8fa7dc8697bfc6618a55f9330 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -988,7 +988,9 @@ static void usb_host_exit_notifier(struct Notifier *n, void *data)
 
     if (s->dh) {
         usb_host_release_interfaces(s);
+        libusb_reset_device(s->dh);
         usb_host_attach_kernel(s);
+        libusb_close(s->dh);
     }
 }
 
diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
index 5b2e21ed185dccbef9233511ddc5530f520913d8..f5d5c9109402d9aa5acdaebd5a595364e1a7652d 100644
--- a/hw/usb/xen-usb.c
+++ b/hw/usb/xen-usb.c
@@ -860,10 +860,14 @@ static int usbback_connect(struct XenDevice *xendev)
     struct usbif_conn_sring *conn_sring;
     int urb_ring_ref;
     int conn_ring_ref;
-    unsigned int i;
+    unsigned int i, max_grants;
 
     TR_BUS(xendev, "start\n");
 
+    /* max_grants: for each request and for the rings (request and connect). */
+    max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2;
+    xen_be_set_max_grant_refs(xendev, max_grants);
+
     usbif = container_of(xendev, struct usbback_info, xendev);
 
     if (xenstore_read_fe_int(xendev, "urb-ring-ref", &urb_ring_ref)) {
@@ -1005,7 +1009,7 @@ static void usbback_alloc(struct XenDevice *xendev)
 {
     struct usbback_info *usbif;
     USBPort *p;
-    unsigned int i, max_grants;
+    unsigned int i;
 
     usbif = container_of(xendev, struct usbback_info, xendev);
 
@@ -1021,10 +1025,6 @@ static void usbback_alloc(struct XenDevice *xendev)
     QTAILQ_INIT(&usbif->req_free_q);
     QSIMPLEQ_INIT(&usbif->hotplug_q);
     usbif->bh = qemu_bh_new(usbback_bh, usbif);
-
-    /* max_grants: for each request and for the rings (request and connect). */
-    max_grants = USBIF_MAX_SEGMENTS_PER_REQUEST * USB_URB_RING_SIZE + 2;
-    xen_be_set_max_grant_refs(xendev, max_grants);
 }
 
 static int usbback_free(struct XenDevice *xendev)