[GIT PULL 09/23] hw/display/virtio-gpu: Fix empty blob discrimination

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

From: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>

Discriminating blobs by checking whether blob_size is nonzero fails for
empty blobs. Identify 2D resources by their non-NULL image instead.

Fixes: bdd53f739273 ("virtio-gpu: Update cursor data using blob")
Fixes: f66767f75c9c ("virtio-gpu: add virtio-gpu/blob vmstate subsection")
Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20260725-image-v1-1-4698a805afde@rsg.ci.i.u-tokyo.ac.jp>
---
 hw/display/virtio-gpu.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index eac039c3c366..add60926f366 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -56,18 +56,18 @@ void virtio_gpu_update_cursor_data(VirtIOGPU *g,
         return;
     }
 
-    if (res->blob_size) {
-        if (res->blob_size < (s->current_cursor->width *
-                              s->current_cursor->height * 4)) {
-            return;
-        }
-        data = res->blob;
-    } else {
+    if (res->image) {
         if (pixman_image_get_width(res->image)  != s->current_cursor->width ||
             pixman_image_get_height(res->image) != s->current_cursor->height) {
             return;
         }
         data = pixman_image_get_data(res->image);
+    } else {
+        if (res->blob_size < (s->current_cursor->width *
+                              s->current_cursor->height * 4)) {
+            return;
+        }
+        data = res->blob;
     }
 
     pixels = s->current_cursor->width * s->current_cursor->height;
@@ -1286,7 +1286,7 @@ static int virtio_gpu_save(QEMUFile *f, void *opaque, size_t size,
     assert(QTAILQ_EMPTY(&g->cmdq));
 
     QTAILQ_FOREACH(res, &g->reslist, next) {
-        if (res->blob_size) {
+        if (!res->image) {
             continue;
         }
         qemu_put_be32(f, res->resource_id);
@@ -1437,7 +1437,7 @@ static int virtio_gpu_blob_save(QEMUFile *f, void *opaque, size_t size,
     assert(QTAILQ_EMPTY(&g->cmdq));
 
     QTAILQ_FOREACH(res, &g->reslist, next) {
-        if (!res->blob_size) {
+        if (res->image) {
             continue;
         }
         assert(!res->image);

-- 
2.55.0