[llvm-bugs] [Bug 35729] New: False positive when returning an inner pointer from malloc'ed block

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35729

            Bug ID: 35729
           Summary: False positive when returning an inner pointer from
                    malloc'ed block
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
          Assignee: dcoughlin at apple.com
          Reporter: christopher.crouzet at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19594
  --> https://bugs.llvm.org/attachment.cgi?id=19594&action=edit
main.c

Hello,

As suggested by the FAQ
(https://clang-analyzer.llvm.org/faq.html#suppress_issue), I am here to report
what I (and Valgrind) believe is a false positive.

When implementing an aligned allocator, it is common to allocate a block and
return to the user only a different pointer located within the block, which
Clang Static Analyzer flags as a potential leak of memory.

Attached is a short code snippet that triggers the false positive.


Regards,
Christopher.

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