From d25d59f9e817d69df89bccf69bb8a1c810ec2e31 Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olvaffe@gmail.com>
Date: Wed, 25 Mar 2020 20:32:43 -0700
Subject: [PATCH] vrend: reject cmd submission for ctx 0

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 src/vrend_decode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/vrend_decode.c b/src/vrend_decode.c
index 844a53b..5b79670 100644
--- a/src/vrend_decode.c
+++ b/src/vrend_decode.c
@@ -1475,6 +1475,9 @@ int vrend_decode_block(uint32_t ctx_id, uint32_t *block, int ndw)
    bool bret;
    int ret;
 
+   if (ctx_id == 0)
+      return EINVAL;
+
    gdctx = vrend_decode_ctx_lookup(ctx_id);
    if (!gdctx)
       return EINVAL;