Rule Definition
The size of integer that is required when a pointer is converted to an integer is implementation-defined. Casting between a pointer and an integer type should be avoided where possible to prevent data loss, but maybe unavoidable when addressing memory-mapped registers or other hardware-specific features. Note that C++ does not permit a pointer to be converted to any floating type.

Remediation
Do not cast a pointer type to an integer. Note: When you have to necessarily do that ensure that the memory allocated to the int is sufficient

Violation Code Sample

struct S
{
int32_t i;
int32_t j;
};
void f ( S * s )
{
int32_t p = reinterpret_cast< int32_t >( s ); // Non-compliant
}

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C:
int *p

Standards Reference: MISRA C++ 2008, Rule 5-2-9: A cast should not convert a pointer type to an integral type. MISRA C 2012, 11.4: A conversion should not be performed between a pointer to object and an integer type AUTOSAR C++, 2014, M5-2-9: A cast should not convert a pointer type to an integral type.