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[SR-8577] Unexpected hangs when running swift-demangle on crafted strings #51095

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swift-ci opened this issue Aug 18, 2018 · 2 comments
Closed

[SR-8577] Unexpected hangs when running swift-demangle on crafted strings #51095

swift-ci opened this issue Aug 18, 2018 · 2 comments
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@eeckstein
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself mangling Area → compiler: Mangling

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@swift-ci
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Previous ID SR-8577
Radar None
Original Reporter hongxuchen (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

Swift version 4.2-dev (LLVM aba011d5dc, Clang 09210590b6, Swift 6f91a4e)
Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, Mangling
Assignee @eeckstein
Priority Medium

md5: 60977606c17b9d7ab6d17c346fdc27e5

Issue Description:

swift-demangle may hang unexpectedly on some crafted strings. For example, for a string like:

_Ttu4222222222222222222222222_rW_2T_2TJ__2D_|D__V_

It can take too long to exit (failed to exit within 30min on my machine).

The suspicious code segment should be inside swift::Demangle::archetypeName[abi:cxx11](unsigned long, unsigned long) at lib/Demangling/NodePrinter.cpp:1821 where the index can be 140737488335472.
@belkadan
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cc @eeckstein

@eeckstein
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fixed in #19152

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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@eeckstein eeckstein

Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself mangling Area → compiler: Mangling
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@belkadan @eeckstein @swift-ci