[llvm-bugs] [Bug 25772] New: Analyzer misses writes to invalid memory

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Dec 8 06:17:58 PST 2015


            Bug ID: 25772
           Summary: Analyzer misses writes to invalid memory
           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

Pointers are kept to some objects on the stack. Once the lifetime of those
objects end, the pointers are used to write to that memory.

$ scan-build g++ -std=c++1z write_invalid_mem.cpp 
scan-build: Using 'local/tmp/clang/bin/clang' for static analysis
scan-build: Removing directory '/tmp/scan-build-2015-12-08-151246-7669-1'
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 33:12

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