virtio-gpu: check max_outputs value

The value must be less than VIRTIO_GPU_MAX_SCANOUT.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 1463653560-26958-4-git-send-email-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 64a60f2..7114021 100644 (file)
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -20,6 +20,7 @@
 #include "hw/virtio/virtio-gpu.h"
 #include "hw/virtio/virtio-bus.h"
 #include "qemu/log.h"
+#include "qapi/error.h"
 
 static struct virtio_gpu_simple_resource*
 virtio_gpu_find_resource(VirtIOGPU *g, uint32_t resource_id);
@@ -929,6 +930,11 @@ static void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
     bool have_virgl;
     int i;
 
+    if (g->conf.max_outputs > VIRTIO_GPU_MAX_SCANOUT) {
+        error_setg(errp, "invalid max_outputs > %d", VIRTIO_GPU_MAX_SCANOUT);
+        return;
+    }
+
     g->config_size = sizeof(struct virtio_gpu_config);
     g->virtio_config.num_scanouts = g->conf.max_outputs;
     virtio_init(VIRTIO_DEVICE(g), "virtio-gpu", VIRTIO_ID_GPU,