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The function `vhost_dev_init()` expects the `struct vhost_dev` (passed as a parameter) to be fully initialized. This is important because some parts of the code check whether `vhost_dev->config_ops` is NULL to determine if it has been set (e.g. later via `vhost_dev_set_config_notifier`). To ensure this initialization, it’s better to allocate the entire `CryptoDevBackendVhost` structure (which includes `vhost_dev`) using `g_mem0()`, following the same approach used for other vhost devices, such as in `vhost_net_init()`. Fixes:042cea274c("cryptodev: add vhost-user as a new cryptodev backend") Cc: qemu-stable@nongnu.org Reported-by: myluo24@m.fudan.edu.cn Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <20250211135523.101203-1-sgarzare@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> (cherry picked from commit83cb18ac45) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>