[PATCH v2 6/8] vhost-user-gpu: fix memory leak in 'virgl_resource_attach_backing' (CVE-2021-3544)

[Li Qiang]

If 'virgl_renderer_resource_attach_iov' failed, the 'res_iovs' will
be leaked.

Fixes: CVE-2021-3544
Reported-by: Li Qiang <liq3ea@163.com>
virtio-gpu fix: 33243031da ("virtio-gpu-3d: fix memory leak
in resource attach backing")

Signed-off-by: Li Qiang <liq3ea@163.com>
---
 contrib/vhost-user-gpu/virgl.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index c669d73a1d..a16a311d80 100644
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -287,8 +287,11 @@ virgl_resource_attach_backing(VuGpu *g,
         return;
     }
 
-    virgl_renderer_resource_attach_iov(att_rb.resource_id,
+    ret = virgl_renderer_resource_attach_iov(att_rb.resource_id,
                                        res_iovs, att_rb.nr_entries);
+    if (ret != 0) {
+        g_free(res_iovs);
+    }
 }
 
 static void
-- 
2.25.1