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C28715

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warning C28715: Cast between semantically different integer types

This warning indicates that a Boolean is being cast to NTSTATUS. This is likely to give undesirable results. For example, the typical failure value for functions that return a Boolean (FALSE) is a success status when tested as an NTSTATUS.

Typically, a function that returns Boolean returns either 1 (for TRUE) or 0 (for FALSE). Both these values are treated as success codes by the NT_SUCCESS macro. Thus, the failure case will never be detected.

Examples

PREfast reports the warning for the following example.

extern BOOL SomeFunction(void);

if (NT_SUCCESS(SomeFunction())) {
   return 0;
} else {
   return -1;
}

The following example avoids the error.

extern BOOL SomeFunction(void);

if (SomeFunction() == TRUE) {
   return 0;
} else {
   return -1;
}