From 74904f39e15961ada40221be418bbd758a5969ef Mon Sep 17 00:00:00 2001
From: andreykproductengine <andreykproductengine@lindenlab.com>
Date: Fri, 29 Nov 2019 18:31:50 +0200
Subject: SL-1130 Prevent crash on mMatrix

---
 indra/llrender/llrender.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 65d6181920..5bcccb35af 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -1458,9 +1458,15 @@ void LLRender::matrixMode(U32 mode)
 	if (mode == MM_TEXTURE)
 	{
 		mode = MM_TEXTURE0 + gGL.getCurrentTexUnitIndex();
+		if (mode > MM_TEXTURE3)
+		{
+			// getCurrentTexUnitIndex() can go as high as 32 (LL_NUM_TEXTURE_LAYERS)
+			// Large value will result in a crash at mMatrix
+			LL_WARNS_ONCE() << "Attempted to assign matrix mode out of bounds: " << mode << LL_ENDL;
+			mode = MM_TEXTURE0;
+		}
 	}
 
-	llassert(mode < NUM_MATRIX_MODES);
 	mMatrixMode = mode;
 }
 
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