fix_stale_validation_cache_on_buffer_deletion.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jamie Madill <jmadill@chromium.org>
Date: Tue, 14 Jul 2020 17:20:18 -0400
Subject: Fix stale validation cache on buffer deletion.

When we would delete the currently bound element array buffer we
would neglect to invalidate a specific validation cache variable.
This incorrectly would let us skip buffer size validation and lead
to internal invalid memory accesses.

Bug: chromium:1105202
Change-Id: I23ab28ccd3ac6b5d461cb8745b930f4d42d53b35
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2323644
Reviewed-by: Jamie Madill <jmadill@chromium.org>

diff --git a/src/libANGLE/Context.cpp b/src/libANGLE/Context.cpp
index 90e80d92b573c96eff7d9747669d5d6dd3943b47..f73391da2bd3461ab5c53b30e9fed7376773a051 100644
--- a/src/libANGLE/Context.cpp
+++ b/src/libANGLE/Context.cpp
@@ -8702,6 +8702,7 @@ void StateCache::onVertexArrayStateChange(Context *context)
     updateActiveAttribsMask(context);
     updateVertexElementLimits(context);
     updateBasicDrawStatesError();
+    updateBasicDrawElementsError();
 }
 
 void StateCache::onVertexArrayBufferStateChange(Context *context)
diff --git a/src/libANGLE/Context.h b/src/libANGLE/Context.h
index 5668bb4f6e83250e1c1bc1007664b0b9c66b86a1..9c2abcae729775701cc5b37f1599b849db5978d3 100644
--- a/src/libANGLE/Context.h
+++ b/src/libANGLE/Context.h
@@ -201,6 +201,7 @@ class StateCache final : angle::NonCopyable
     // 1. onActiveTransformFeedbackChange.
     // 2. onVertexArrayBufferStateChange.
     // 3. onBufferBindingChange.
+    // 4. onVertexArrayStateChange.
     intptr_t getBasicDrawElementsError(Context *context) const
     {
         if (mCachedBasicDrawElementsError != kInvalidPointer)