usb-redir: Fix crash on migration with no client connected

If no client is connected on the src side, then we won't receive a
parser during migrate, in this case usbredir_post_load() should be a nop,
rather then to try to derefefence the NULL dev->parser pointer.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 3713e1485e6eace7d48b9c790602cfd92c616e5f)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 8c0ead07c5f45494ac6ae8f709af14025be7913c..1406e3fd6f165f5f5c3c1fed8a9d1e3c83ad5bd0 100644 (file)
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -1985,6 +1985,10 @@ static int usbredir_post_load(void *priv, int version_id)
 {
     USBRedirDevice *dev = priv;
 
+    if (dev->parser == NULL) {
+        return 0;
+    }
+
     switch (dev->device_info.speed) {
     case usb_redir_speed_low:
         dev->dev.speed = USB_SPEED_LOW;