[PULL 08/13] hw/display/virtio-gpu: fix dmabuf_fd leak on remap failure

["Philippe Mathieu-Daudé" <philmd@oss.qualcomm.com>]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

When virtio_gpu_create_udmabuf() succeeds but virtio_gpu_remap_udmabuf()
fails (mmap returns MAP_FAILED), virtio_gpu_init_udmabuf() returns early
without closing the dmabuf fd. Since res->blob is never set in this
path, later cleanup via virtio_gpu_cleanup_mapping() skips
virtio_gpu_fini_udmabuf() entirely, leaking the file descriptor.

Call virtio_gpu_destroy_udmabuf() before the early return to close
the fd. This function already handles partial state correctly: it
skips the munmap when res->remapped is NULL and closes the fd when
res->dmabuf_fd >= 0.

Fixes: 9b60cdf98723 ("virtio-gpu: Add udmabuf helpers")
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Message-ID: <20260713125622.111513-1-marcandre.lureau@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
---
 hw/display/virtio-gpu-udmabuf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/display/virtio-gpu-udmabuf.c b/hw/display/virtio-gpu-udmabuf.c
index d5ac1cfca0e..5f08c855dde 100644
--- a/hw/display/virtio-gpu-udmabuf.c
+++ b/hw/display/virtio-gpu-udmabuf.c
@@ -143,6 +143,7 @@ void virtio_gpu_init_udmabuf(struct virtio_gpu_simple_resource *res)
         }
         virtio_gpu_remap_udmabuf(res);
         if (!res->remapped) {
+            virtio_gpu_destroy_udmabuf(res);
             return;
         }
         pdata = res->remapped;
-- 
2.53.0