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DataFlowSanitizer: fix a use-after-free. Spotted by libgmalloc.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188216 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2013-08-12 22:38:39 +00:00
parent f15dfe4eb4
commit a90d91fd1a
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
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@ -422,9 +422,12 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
// instruction's next pointer and moving the next instruction to the // instruction's next pointer and moving the next instruction to the
// tail block from which we should continue. // tail block from which we should continue.
Instruction *Next = Inst->getNextNode(); Instruction *Next = Inst->getNextNode();
// DFSanVisitor may delete Inst, so keep track of whether it was a
// terminator.
bool IsTerminator = isa<TerminatorInst>(Inst);
if (!DFSF.SkipInsts.count(Inst)) if (!DFSF.SkipInsts.count(Inst))
DFSanVisitor(DFSF).visit(Inst); DFSanVisitor(DFSF).visit(Inst);
if (isa<TerminatorInst>(Inst)) if (IsTerminator)
break; break;
Inst = Next; Inst = Next;
} }