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Fix use after free when deleting attributes in a chained folding set.

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Can't follow the intrusive linked list when the element is gone.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165898 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-10-14 08:48:40 +00:00
parent 2492a38afc
commit fd8d62c0b4
1 changed files with 5 additions and 3 deletions
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8
lib/VMCore/LLVMContextImpl.cpp
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@ -97,9 +97,11 @@ LLVMContextImpl::~LLVMContextImpl() {
// Destroy attributes.
for (FoldingSetIterator<AttributesImpl> I = AttrsSet.begin(),
E = AttrsSet.end(); I != E; ++I)
delete &*I;
E = AttrsSet.end(); I != E;) {
FoldingSetIterator<AttributesImpl> Elem = I++;
delete &*Elem;
}
// Destroy MDNodes. ~MDNode can move and remove nodes between the MDNodeSet
// and the NonUniquedMDNodes sets, so copy the values out first.
SmallVector<MDNode*, 8> MDNodes;