From 8e594bc8e9f1af9cb89a1b4937c8ee4c5ca69131 Mon Sep 17 00:00:00 2001
From: Kai Blaschke <kai.blaschke@kb-dev.net>
Date: Wed, 25 Jan 2023 15:28:34 +0100
Subject: [PATCH] Fix index-out-of-bounds crash when getting shader param
 substring.

---
 src/libprojectM/Renderer/ShaderEngine.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libprojectM/Renderer/ShaderEngine.cpp b/src/libprojectM/Renderer/ShaderEngine.cpp
index 9f4b5a585..a9a6af442 100644
--- a/src/libprojectM/Renderer/ShaderEngine.cpp
+++ b/src/libprojectM/Renderer/ShaderEngine.cpp
@@ -255,7 +255,8 @@ GLuint ShaderEngine::compilePresetShader(const PresentShaderType shaderType, Sha
 
             if (texDesc.first == NULL)
             {
-                if (lowerCaseName.substr(0, 4) == "rand" || lowerCaseName.substr(2, 5) == "_rand")
+                if ((lowerCaseName.size() >= 4 && lowerCaseName.substr(0, 4) == "rand") ||
+                    (lowerCaseName.size() >= 5 && lowerCaseName.substr(2, 5) == "_rand"))
                 {
                     texDesc = textureManager->getRandomTextureName(sampler);
                 }