[PATCH] ui/gtk: making dmabuf NULL when it's released.

[Dongwon Kim <dongwon.kim@intel.com>]

Set vc->gfx.guest_fb.dmabuf to NULL to prevent any further access
to it after the dmabuf is released.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
 ui/gtk.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ui/gtk.c b/ui/gtk.c
index e50f950f2b..0b8bf8ea8a 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -587,8 +587,12 @@ static bool gd_has_dmabuf(DisplayChangeListener *dcl)
 static void gd_gl_release_dmabuf(DisplayChangeListener *dcl,
                                  QemuDmaBuf *dmabuf)
 {
+    VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 #ifdef CONFIG_GBM
     egl_dmabuf_release_texture(dmabuf);
+    if (vc->gfx.guest_fb.dmabuf == dmabuf) {
+        vc->gfx.guest_fb.dmabuf = NULL;
+    }
 #endif
 }
 
-- 
2.34.1