From d7d827789b4cbb1b55edae890f510302eff2eb49 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Foucault?= <foucault.clem@gmail.com>
Date: Tue, 15 Feb 2022 00:48:18 +0100
Subject: GLShaderInterface: Fix undefined behavior when attributes are
 optimized away.

Optimized out attributes returns an invalid location `-1` resulting in
an undefined behavior shift.
---
 source/blender/gpu/opengl/gl_shader_interface.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'source')

diff --git a/source/blender/gpu/opengl/gl_shader_interface.cc b/source/blender/gpu/opengl/gl_shader_interface.cc
index 71b908665d3..292e52e857b 100644
--- a/source/blender/gpu/opengl/gl_shader_interface.cc
+++ b/source/blender/gpu/opengl/gl_shader_interface.cc
@@ -391,7 +391,9 @@ GLShaderInterface::GLShaderInterface(GLuint program, const shader::ShaderCreateI
     else {
       input->location = input->binding = attr.index;
     }
-    enabled_attr_mask_ |= (1 << input->location);
+    if (input->location != -1) {
+      enabled_attr_mask_ |= (1 << input->location);
+    }
     input++;
   }
 
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