From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jamie Madill <jmadill@chromium.org>
Date: Fri, 3 Sep 2021 09:34:10 -0400
Subject: WebGL: Make unsuccessful links fail subsequent draw calls.

This protects against incomplete state updates during a failed
link call that can interfere with draw calls.

Bug: angleproject:6358
Bug: chromium:1241123
Change-Id: Ie892654c3a58c69d6e35ba3c41758ab6269d8193
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3140496
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3152556
Reviewed-by: Jamie Madill <jmadill@chromium.org>

diff --git a/src/libANGLE/validationES.cpp b/src/libANGLE/validationES.cpp
index 4ed0ea4f47c89090d06f706199d32bb0f5b745b9..40574e58d20363710a1312ddaa39ba2eb685b6b8 100644
--- a/src/libANGLE/validationES.cpp
+++ b/src/libANGLE/validationES.cpp
@@ -3881,6 +3881,12 @@ const char *ValidateDrawStates(const Context *context)
             {
                 return kVertexBufferBoundForTransformFeedback;
             }
+
+            // Validate that we are rendering with a linked program.
+            if (!program->isLinked())
+            {
+                return kProgramNotLinked;
+            }
         }
     }