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C6387

warning C6387: <argument> may be <value>: this does not adhere to the specification for the function <function name>: Lines: x, y

This warning is raised if an annotated function parameter is being passed an unexpected value. For example, passing a potentially null value to a parameter that is marked with _In_ annotation generates this warning.

The following code generates this warning because a null parameter is passed to f(char *):

#include <sal.h>

_Post_ _Null_ char * g();

void f(_In_ char *pch);

void main()
{
    char *pCh = g();
    f(pCh); // Warning C6387
}

To correct this warning, use the following code:

#include <sal.h>

_Post_ _Notnull_ char * g();

void f(_In_ char *pch);

void main()
{
    char *pCh = g();
    f(pCh);
}
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