We cannot create null constants for certain types, e.g. VoidTy,
FunctionTy or LabelTy. getNullValue asserts if we pass in an
unsupported type. We should also check for opaque types, but I'm not
sure how.
This fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14795.
Reviewers: t.p.northover, jfb, vsk
Reviewed By: vsk
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D65897
llvm-svn: 369557
CurTy = flattenPointerTypes(CurFullTy);
continue; // Skip the ValueList manipulation.
case bitc::CST_CODE_NULL: // NULL
+ if (CurTy->isVoidTy() || CurTy->isFunctionTy() || CurTy->isLabelTy())
+ return error("Invalid type for a constant null value");
V = Constant::getNullValue(CurTy);
break;
case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
--- /dev/null
+; Bitcode with a CST_CODE_NULL with void type.
+
+; RUN: not llvm-dis %s.bc -o - 2>&1 | FileCheck %s
+
+; CHECK: error: Invalid type for a constant null value
+