[clang] 12038be - [Concepts] Fix crash in D41910

[Saar Raz via cfe-commits]

Author: Saar Raz
Date: 2019-12-18T21:31:33+02:00
New Revision: 12038be20ee6a903cdbd3fddce65535ef683e31d

URL: https://github.com/llvm/llvm-project/commit/12038be20ee6a903cdbd3fddce65535ef683e31d
DIFF: https://github.com/llvm/llvm-project/commit/12038be20ee6a903cdbd3fddce65535ef683e31d.diff

LOG: [Concepts] Fix crash in D41910

Differential Revision: https://reviews.llvm.org/D41910

Added: 
    

Modified: 
    clang/lib/Sema/SemaConcept.cpp

Removed: 
    


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diff  --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index cd41000fa023..f9d54a811469 100755
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -558,7 +558,7 @@ static bool substituteParameterMappings(Sema &S, NormalizedConstraint &N,
     Atomic.ParameterMapping.emplace();
     Atomic.ParameterMapping->reserve(OccurringIndices.size());
     for (unsigned I = 0, C = TemplateParams->size(); I != C; ++I)
-      if (OccurringIndices[I])
+      if (I < OccurringIndices.size() && OccurringIndices[I])
         Atomic.ParameterMapping->push_back(
             S.getIdentityTemplateArgumentLoc(TemplateParams->begin()[I],
                 // Here we assume we do not support things like