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Make sure Op->getType() is a PointerType before we cast<> it.

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Bug found with AFL fuzz.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236193 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Filipe Cabecinhas 2015-04-30 01:13:31 +00:00
parent 49baa9f896
commit 8b2199e2a2
3 changed files with 7 additions and 0 deletions
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2
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -4065,6 +4065,8 @@ std::error_code BitcodeReader::ParseFunctionBody(Function *F) {
Type *Ty = nullptr;
if (OpNum + 3 == Record.size())
Ty = getTypeByID(Record[OpNum++]);
if (!isa<PointerType>(Op->getType()))
return Error("Load operand is not a pointer type");
if (!Ty)
Ty = cast<PointerType>(Op->getType())->getElementType();
else if (Ty != cast<PointerType>(Op->getType())->getElementType())

BIN
test/Bitcode/Inputs/invalid-load-pointer-type.bc Normal file
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5
test/Bitcode/invalid.test
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@ -117,3 +117,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-too-big-fwdref.bc 2>&1 | \
RUN: FileCheck --check-prefix=HUGE-FWDREF %s
HUGE-FWDREF: Invalid record
RUN: not llvm-dis -disable-output %p/Inputs/invalid-load-pointer-type.bc 2>&1 | \
RUN: FileCheck --check-prefix=LOAD-BAD-TYPE %s
LOAD-BAD-TYPE: Load operand is not a pointer type