From d708651c537623d09bf3c13a764c24259c4cc9a6 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Wed, 5 Jan 2022 12:38:38 +1100
Subject: [PATCH] [client] egl: check for null gl strings

---
 client/renderers/EGL/egl.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/client/renderers/EGL/egl.c b/client/renderers/EGL/egl.c
index 6d179776..d5f4aa5d 100644
--- a/client/renderers/EGL/egl.c
+++ b/client/renderers/EGL/egl.c
@@ -766,6 +766,12 @@ static bool egl_renderStartup(LG_Renderer * renderer, bool useDMA)
   }
 
   const char * client_exts = eglQueryString(this->display, EGL_EXTENSIONS);
+  if (!client_exts)
+  {
+    DEBUG_ERROR("Failed to query EGL_EXTENSIONS");
+    return false;
+  }
+
   bool debugContext = option_get_bool("egl", "debug");
   EGLint ctxattr[5];
   int ctxidx = 0;
@@ -814,7 +820,18 @@ static bool egl_renderStartup(LG_Renderer * renderer, bool useDMA)
 
   eglMakeCurrent(this->display, this->surface, this->surface, this->context);
   const char * gl_exts = (const char *)glGetString(GL_EXTENSIONS);
+  if (!gl_exts)
+  {
+    DEBUG_ERROR("Failed to query GL_EXTENSIONS");
+    return false;
+  }
+
   const char * vendor  = (const char *)glGetString(GL_VENDOR);
+  if (!vendor)
+  {
+    DEBUG_ERROR("Failed to query GL_VENDOR");
+    return false;
+  }
 
   DEBUG_INFO("EGL     : %d.%d", maj, min);
   DEBUG_INFO("Vendor  : %s", vendor);