un-register kbd driver in case of USB kbd unplug.

If a USB keyboard is unplugged, the keyboard eventhandler is never
removed, and events will continue to be passed through to the device,
causing crashes or memory corruption.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

3 files changed, 13 insertions, 2 deletions

diff --git a/console.h b/console.h
index cac959f64..aafb0312c 100644
--- a/console.h
+++ b/console.h
@@ -42,6 +42,7 @@ typedef struct QEMUPutLEDEntry {
 } QEMUPutLEDEntry;
 
 void qemu_add_kbd_event_handler(QEMUPutKBDEvent *func, void *opaque);
+void qemu_remove_kbd_event_handler(void);
 QEMUPutMouseEntry *qemu_add_mouse_event_handler(QEMUPutMouseEvent *func,
                                                 void *opaque, int absolute,
                                                 const char *name);
diff --git a/hw/usb-hid.c b/hw/usb-hid.c
index 228d0a052..882d93346 100644
--- a/hw/usb-hid.c
+++ b/hw/usb-hid.c
@@ -855,9 +855,13 @@ static void usb_hid_handle_destroy(USBDevice *dev)
 {
     USBHIDState *s = (USBHIDState *)dev;
 
-    if (s->kind != USB_KEYBOARD)
+    switch(s->kind) {
+    case USB_KEYBOARD:
+        qemu_remove_kbd_event_handler();
+        break;
+    default:
         qemu_remove_mouse_event_handler(s->ptr.eh_entry);
-    /* TODO: else */
+    }
 }
 
 static int usb_hid_initfn(USBDevice *dev, int kind)
diff --git a/input.c b/input.c
index 651442d79..ec05548f7 100644
--- a/input.c
+++ b/input.c
@@ -42,6 +42,12 @@ void qemu_add_kbd_event_handler(QEMUPutKBDEvent *func, void *opaque)
     qemu_put_kbd_event = func;
 }
 
+void qemu_remove_kbd_event_handler(void)
+{
+    qemu_put_kbd_event_opaque = NULL;
+    qemu_put_kbd_event = NULL;
+}
+
 static void check_mode_change(void)
 {
     static int current_is_absolute, current_has_absolute;