[PATCH 55/64] vhost-user-gpu: fix memory disclosure in virgl_cmd_get_capset_info (CVE-2021-3545)

[Michael Roth]

From: Li Qiang <liq...@163.com>

Otherwise some of the 'resp' will be leaked to guest.

Fixes: CVE-2021-3545
Reported-by: Li Qiang <liq...@163.com>
virtio-gpu fix: 42a8dadc74 ("virtio-gpu: fix information leak
in getting capset info dispatch")

Signed-off-by: Li Qiang <liq...@163.com>
Reviewed-by: Marc-André Lureau <marcandre.lur...@redhat.com>
Message-Id: <20210516030403.107723-2-liq...@163.com>
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
(cherry picked from commit 121841b25d72d13f8cad554363138c360f1250ea)
Signed-off-by: Michael Roth <michael.r...@amd.com>
---
 contrib/vhost-user-gpu/virgl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index 9e6660c7ab..6a332d601f 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -128,6 +128,7 @@ virgl_cmd_get_capset_info(VuGpu *g,
 
     VUGPU_FILL_CMD(info);
 
+    memset(&resp, 0, sizeof(resp));
     if (info.capset_index == 0) {
         resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL;
         virgl_renderer_get_cap_set(resp.capset_id,
-- 
2.25.1