[BitCode] Diagnose GEPs with no indices

llvm-svn: 271849

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -3090,6 +3090,9 @@ std::error_code BitcodeReader::parseConstants() {
         return error("Explicit gep operator type does not match pointee type "
                      "of pointer operand");
 
+      if (Elts.size() < 1)
+        return error("Invalid gep with no operands");
+
       ArrayRef<Constant *> Indices(Elts.begin() + 1, Elts.end());
       V = ConstantExpr::getGetElementPtr(PointeeType, Elts[0], Indices,
                                          BitCode ==

llvm/test/Bitcode/invalid.test

@@ -217,3 +217,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-void-constant.bc 2>&1 | \
 RUN:   FileCheck --check-prefix=VOID-CONSTANT-TYPE %s
 
 VOID-CONSTANT-TYPE: Invalid constant type
+
+RUN: not llvm-dis -disable-output %p/Inputs/invalid-gep-no-operands.bc 2>&1 | \
+RUN:   FileCheck --check-prefix=GEP-NO-OPERANDS %s
+
+GEP-NO-OPERANDS: Invalid gep with no operands