From 673f4d0c1dfe78f66e8d7f036c619065800022de Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olvaffe@gmail.com>
Date: Wed, 21 Jul 2021 13:08:12 -0700
Subject: [PATCH] vrend: fix boundary check for SSBO state update

(PIPE_MAX_SHADER_BUFFERS - num_ssbo) can underflow.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
---
 src/vrend_decode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vrend_decode.c b/src/vrend_decode.c
index 35ccc23..9fc3552 100644
--- a/src/vrend_decode.c
+++ b/src/vrend_decode.c
@@ -1208,7 +1208,7 @@ static int vrend_decode_set_shader_buffers(struct vrend_context *ctx, const uint
       return 0;
 
    if (start_slot > PIPE_MAX_SHADER_BUFFERS ||
-       start_slot > PIPE_MAX_SHADER_BUFFERS - num_ssbo)
+       num_ssbo > PIPE_MAX_SHADER_BUFFERS - start_slot)
       return EINVAL;
 
    for (uint32_t i = 0; i < num_ssbo; i++) {