vhost-user-gpu: fix leak in 'virgl_resource_attach_backing' (CVE-2021-3544)

Git-commit: 63736af5a6571d9def93769431e0d7e38c6677bf
References: CVE-2021-3544

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>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210516030403.107723-7-liq3ea@163.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
[jrz: tweak title to not break spec file]

diff --git a/contrib/vhost-user-gpu/virgl.c b/contrib/vhost-user-gpu/virgl.c
index ec8caca72f08026bf3cf859d2a553d0604f16d48..305caceba71e371d1534ad8237daee03f837bb54 100644 (file)
--- a/contrib/vhost-user-gpu/virgl.c
+++ b/contrib/vhost-user-gpu/virgl.c
@@ -284,8 +284,11 @@ 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