[llvm-bugs] [Bug 35419] New: False negative on post-increment of uninitialized value

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35419

            Bug ID: 35419
           Summary: False negative on post-increment of uninitialized
                    value
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: dcoughlin at apple.com
          Reporter: dcoughlin at apple.com
                CC: llvm-bugs at lists.llvm.org

The analyzer doesn't diagnose when post incrementing an uninitialized variable:

$ cat test_pp_uninit.c
void foo() {
  int p;
  p++; // A diagnostic should be emitted here
}

$ clang -cc1 -analyze -analyzer-checker=core test_pp_uninit.c 
$

It looks like the UndefinedAssignmentChecker is missing a case for
UnaryOperator in its checkBind() method.

This is a great starter bug.

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