virtio-gpu: fix error handling in virgl_cmd_resource_create_blob

Fix inverted error check in virgl_cmd_resource_create_blob() that causes
the function to return error when virtio_gpu_create_mapping_iov() succeeds.

virtio_gpu_create_mapping_iov() returns 0 on success and negative values
on error. The check 'if (!ret)' incorrectly treats success (ret=0) as an
error condition, causing the function to fail when it should succeed.

Change the condition to 'if (ret != 0)' to properly detect errors.

Fixes: 7c092f17ccee ("virtio-gpu: Handle resource blob commands")
Signed-off-by: Honglei Huang <honghuan@amd.com>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20260113015203.3643608-2-honghuan@amd.com>

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 6a83fb63c8e4bbc5c7ccabad21d9dadd48fcc7df..741728cabbeca17ba8155fcfcdb7bb7685e004df 100644 (file)
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -705,7 +705,7 @@ static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
         ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
                                             cmd, &res->base.addrs,
                                             &res->base.iov, &res->base.iov_cnt);
-        if (!ret) {
+        if (ret != 0) {
             cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
             return;
         }