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Fix SEGV in InlineAsm::ConstraintInfo::Parse.

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Fixes bug 24646. Previous code was not checking if an index into a vector
was valid, resulting in a SEGV. Fixed by assuming the construct can't
be parsed when given this input.

llvm-svn: 246773
This commit is contained in:
Karl Schimpf 2015-09-03 15:41:34 +00:00
parent 345c0f08ed
commit 2d3030ebd1
1 changed files with 2 additions and 1 deletions
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3
lib/IR/InlineAsm.cpp
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@ -159,6 +159,8 @@ bool InlineAsm::ConstraintInfo::Parse(StringRef Str,
// If Operand N already has a matching input, reject this. An output
// can't be constrained to the same value as multiple inputs.
if (isMultipleAlternative) {
if (multipleAlternativeIndex >= ConstraintsSoFar[N].multipleAlternatives.size())
return true;
InlineAsm::SubConstraintInfo &scInfo =
ConstraintsSoFar[N].multipleAlternatives[multipleAlternativeIndex];
if (scInfo.MatchingInput != -1)
@ -290,4 +292,3 @@ bool InlineAsm::Verify(FunctionType *Ty, StringRef ConstStr) {
if (Ty->getNumParams() != NumInputs) return false;
return true;
}