Merge remote-tracking branch 'remotes/kraxel/tags/usb-20180507-pull-request' into staging

usb: fixes for mtp and host.

# gpg: Signature made Mon 07 May 2018 10:44:26 BST
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/usb-20180507-pull-request:
  usb-host: skip open on pending postload bh
  usb-mtp: Unconditionally check for the readonly bit
  usb-mtp: Add some NULL checks for issues pointed out by coverity

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 15 insertions, 7 deletions

diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
index 6ecf70a79b..3d59fe4944 100644
--- a/hw/usb/dev-mtp.c
+++ b/hw/usb/dev-mtp.c
@@ -1446,8 +1446,7 @@ static void usb_mtp_command(MTPState *s, MTPControl *c)
             if (o == NULL) {
                 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE, c->trans,
                                      0, 0, 0, 0);
-            }
-            if (o->format != FMT_ASSOCIATION) {
+            } else if (o->format != FMT_ASSOCIATION) {
                 usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT, c->trans,
                                      0, 0, 0, 0);
             }
@@ -1660,6 +1659,7 @@ static void usb_mtp_write_metadata(MTPState *s)
     uint32_t next_handle = s->next_handle;
 
     assert(!s->write_pending);
+    assert(p != NULL);
 
     utf16_to_str(dataset->length, dataset->filename, filename);
 
@@ -1838,7 +1838,7 @@ static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
             p->status = USB_RET_STALL;
             return;
         }
-        if (s->data_out && !s->data_out->first) {
+        if ((s->data_out != NULL) && !s->data_out->first) {
             container_type = TYPE_DATA;
         } else {
             usb_packet_copy(p, &container, sizeof(container));
@@ -1948,16 +1948,17 @@ static void usb_mtp_realize(USBDevice *dev, Error **errp)
             return;
         }
         s->desc = strrchr(s->root, '/');
-        /* Mark store as RW */
-        if (!s->readonly) {
-            s->flags |= (1 << MTP_FLAG_WRITABLE);
-        }
         if (s->desc && s->desc[0]) {
             s->desc = g_strdup(s->desc + 1);
         } else {
             s->desc = g_strdup("none");
         }
     }
+    /* Mark store as RW */
+    if (!s->readonly) {
+        s->flags |= (1 << MTP_FLAG_WRITABLE);
+    }
+
 }
 
 static const VMStateDescription vmstate_usb_mtp = {
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index dc0a8fe295..f31e9cbbb8 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -102,6 +102,7 @@ struct USBHostDevice {
     /* callbacks & friends */
     QEMUBH                           *bh_nodev;
     QEMUBH                           *bh_postld;
+    bool                             bh_postld_pending;
     Notifier                         exit;
 
     /* request queues */
@@ -870,6 +871,10 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev)
     int rc;
     Error *local_err = NULL;
 
+    if (s->bh_postld_pending) {
+        return -1;
+    }
+
     trace_usb_host_open_started(bus_num, addr);
 
     if (s->dh != NULL) {
@@ -1528,6 +1533,7 @@ static void usb_host_post_load_bh(void *opaque)
     if (udev->attached) {
         usb_device_detach(udev);
     }
+    dev->bh_postld_pending = false;
     usb_host_auto_check(NULL);
 }
 
@@ -1539,6 +1545,7 @@ static int usb_host_post_load(void *opaque, int version_id)
         dev->bh_postld = qemu_bh_new(usb_host_post_load_bh, dev);
     }
     qemu_bh_schedule(dev->bh_postld);
+    dev->bh_postld_pending = true;
     return 0;
 }