[llvm-bugs] [Bug 25770] New: Analyzer misses dangling reference

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Dec 8 05:57:53 PST 2015


            Bug ID: 25770
           Summary: Analyzer misses dangling reference
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: t at sharklasers.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15412
  --> https://llvm.org/bugs/attachment.cgi?id=15412&action=edit
Code demonstrating the bug

The code produces a temporary unique_ptr that is dereferenced to obtain a
const& to the managed heap allocated object. unique_ptr is destroyed, deletes
the object and the reference is left dangling.

$ scan-build g++ -std=c++1z dangling_ref.cpp 
scan-build: Using 'local/tmp/clang/bin/clang' for static analysis
scan-build: Removing directory '/tmp/scan-build-2015-12-08-145243-7071-1'
because it contains no reports.
scan-build: No bugs found.

Example taken from the talk "CppCon 2015: Herb Sutter "Writing Good C++14... By
Default" at 44:04 (a Microsoft static analysis tool was demonstrated that is
supposedly able to catch this bug)

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