[Qemu-devel] [PATCH] virtio-gpu: fix information leak in capset get dispatch

[Li Qiang]

From: Li Qiang <address@hidden>

In virgl_cmd_get_capset function, it uses g_malloc to allocate
a response struct to the guest. As the 'resp'struct hasn't been full
initialized it will lead the 'resp->padding' field to the guest.
Use g_malloc0 to avoid this.

Signed-off-by: Li Qiang <address@hidden>
---
 hw/display/virtio-gpu-3d.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/display/virtio-gpu-3d.c b/hw/display/virtio-gpu-3d.c
index 23f39de..d98b140 100644
--- a/hw/display/virtio-gpu-3d.c
+++ b/hw/display/virtio-gpu-3d.c
@@ -371,7 +371,7 @@ static void virgl_cmd_get_capset(VirtIOGPU *g,
 
     virgl_renderer_get_cap_set(gc.capset_id, &max_ver,
                                &max_size);
-    resp = g_malloc(sizeof(*resp) + max_size);
+    resp = g_malloc0(sizeof(*resp) + max_size);
 
     resp->hdr.type = VIRTIO_GPU_RESP_OK_CAPSET;
     virgl_renderer_fill_caps(gc.capset_id,
-- 
1.8.3.1