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[BitcodeReader] Check if we can create a null constant for type.

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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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369557 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Florian Hahn 2019-08-21 18:20:11 +00:00
parent 0fc3ded3ad
commit 47b49a52ae
3 changed files with 8 additions and 0 deletions
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2
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -2377,6 +2377,8 @@ Error BitcodeReader::parseConstants() {
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]

6
test/Bitcode/invalid-type-for-null-constant.ll Normal file
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@ -0,0 +1,6 @@
; 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

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test/Bitcode/invalid-type-for-null-constant.ll.bc Normal file
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