# No SafeHandle.DangerousGetHandle
# Detects calls to SafeHandle.DangerousGetHandle()
id: no-dangerous-get-handle
name: SafeHandle.DangerousGetHandle Should Not Be Called
severity: warning
category: reliability
defect_class: correctness
inline_tier: blocking
language: csharp

message: "SafeHandle.DangerousGetHandle should not be called — use DangerousAddRef/DangerousRelease"

description: |
  DangerousGetHandle() doesn't increment the reference count, so the
  handle could be closed while being used. Use DangerousAddRef() and
  DangerousRelease() for safe handle access.

  ✅ FIX: Use proper reference counting

  ```csharp
  bool refAdded = false;
  try {
      handle.DangerousAddRef(ref refAdded);
      IntPtr ptr = handle.DangerousGetHandle();
      // Use ptr...
  } finally {
      if (refAdded) handle.DangerousRelease();
  }
  ```

query: |
  (invocation_expression
    function: (member_access_expression
      name: (identifier) @METHOD (#eq? @METHOD "DangerousGetHandle")) @CALL)

metavars:
  - METHOD
  - CALL

tags:
  - reliability
  - csharp
  - leak
  - security

examples:
  bad: |
    IntPtr ptr = handle.DangerousGetHandle();  // BAD - no ref counting

  good: |
    bool refAdded = false;
    try {
        handle.DangerousAddRef(ref refAdded);
        IntPtr ptr = handle.DangerousGetHandle();  // GOOD - within addref
    } finally {
        if (refAdded) handle.DangerousRelease();
    }

has_fix: false