[PATCH v1] ui/gtk-egl: Check for a valid context before making EGL calls

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

Since not all listeners (i.e VirtualConsoles) of GL events have
a valid EGL context, make sure that there is a valid context
before making EGL calls.

This fixes the following crash seen while launching the VM with
"-device virtio-gpu-pci,max_outputs=1,blob=true -display gtk,gl=on"

No provider of eglCreateImageKHR found.  Requires one of:
EGL_KHR_image
EGL_KHR_image_base

Fixes: 7cc712e9862ff ("ui: dispatch GL events to all listeners")

Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 ui/gtk-egl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
index e3bd4bc274..31175827d0 100644
--- a/ui/gtk-egl.c
+++ b/ui/gtk-egl.c
@@ -244,6 +244,10 @@ void gd_egl_scanout_dmabuf(DisplayChangeListener *dcl,
 #ifdef CONFIG_GBM
     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 
+    if (!vc->gfx.ectx || !vc->gfx.esurface) {
+        return;
+    }
+
     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
                    vc->gfx.esurface, vc->gfx.ectx);
 
@@ -269,6 +273,10 @@ void gd_egl_cursor_dmabuf(DisplayChangeListener *dcl,
 #ifdef CONFIG_GBM
     VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
 
+    if (!vc->gfx.ectx || !vc->gfx.esurface) {
+        return;
+    }
+
     if (dmabuf) {
         egl_dmabuf_import_texture(dmabuf);
         if (!dmabuf->texture) {
-- 
2.35.1