[PATCH 2/2] qxl: Fix race on accessing cursor in struct SimpleSpiceDisplay

[Hyman Huang]

Both the spice server and the qemu (iothread/main loop) context
can access the cursor field in struct SimpleSpiceDisplay.

Add the mutex lock before accessing cursor in
qxl_spice_reset_cursor().

Signed-off-by: Hyman Huang <yong.hu...@smartx.com>
---
 hw/display/qxl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index ae2d983299..d1fbeb65cf 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -298,10 +298,12 @@ void qxl_spice_reset_cursor(PCIQXLDevice *qxl)
     qemu_mutex_lock(&qxl->track_lock);
     qxl->guest_cursor = 0;
     qemu_mutex_unlock(&qxl->track_lock);
+    qemu_mutex_lock(&qxl->ssd.lock);
     if (qxl->ssd.cursor) {
         cursor_unref(qxl->ssd.cursor);
     }
     qxl->ssd.cursor = cursor_builtin_hidden();
+    qemu_mutex_unlock(&qxl->ssd.lock);
 }
 
 static uint32_t qxl_crc32(const uint8_t *p, unsigned len)
-- 
2.39.1