Fix an OOB access bug with RewriteRowMajorMatrices

Bug: angleproject:2273 Change-Id: I27109b873a290133cf3d016f612e1fd1de9d354c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2341763Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

Fix an OOB access bug with RewriteRowMajorMatrices
e3988722 · Shahbaz Youssefi · Commit Bot · e26c5e07 · e3988722
Commit e3988722 authored Aug 06, 2020 by Shahbaz Youssefi Committed by Commit Bot Aug 07, 2020
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RewriteRowMajorMatrices.cpp src/compiler/translator/tree_ops/RewriteRowMajorMatrices.cpp +4 -1

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--- a/src/compiler/translator/tree_ops/RewriteRowMajorMatrices.cpp
+++ b/src/compiler/translator/tree_ops/RewriteRowMajorMatrices.cpp
@@ -261,7 +261,10 @@ class TransformArrayHelper
        // The last value is unused, and is not present.
        TVector<unsigned int> accumulatedArraySizes(arraySizes.size() - 1);
-        accumulatedArraySizes[0] = arraySizes[0];
+        if (accumulatedArraySizes.size() > 0)
+        {
+            accumulatedArraySizes[0] = arraySizes[0];
+        }
        for (size_t index = 1; index + 1 < arraySizes.size(); ++index)
        {
            accumulatedArraySizes[index] = accumulatedArraySizes[index - 1] * arraySizes[index];