[GIT PULL 14/19] hw/display/virtio-gpu: Avoid mmap() for empty blob

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

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

Calling mmap() for an empty blob fails with EINVAL, causing QEMU to
emit a spurious warning.

Fixes: e0933d91b1cd ("virtio-gpu: Add virtio_gpu_resource_create_blob")
Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20260825-dmabuf-v2-2-b3d64d3b9a0e@rsg.ci.i.u-tokyo.ac.jp>
---
 hw/display/virtio-gpu-udmabuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/display/virtio-gpu-udmabuf.c b/hw/display/virtio-gpu-udmabuf.c
index 816f52a51457..ba02ba9e8616 100644
--- a/hw/display/virtio-gpu-udmabuf.c
+++ b/hw/display/virtio-gpu-udmabuf.c
@@ -139,7 +139,7 @@ void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res)
     if (res->iov_cnt == 1 &&
         res->iov[0].iov_len < 4096) {
         pdata = res->iov[0].iov_base;
-    } else {
+    } else if (res->blob_size) {
         virtio_gpu_create_udmabuf(res);
         if (res->dmabuf_fd < 0) {
             return;

-- 
2.55.0.543.g5ebe2ebe4ea8