Polyspace code prover warns Illegally Dereferenced ambiguously ?

Hello Code Prover support team,

I bought a Polyspace license from Mathworks and have run Polyspace code prover.

In my context, the tool generated an orange warning as below:

I am not aware much of the warning "Points to 4 bytes at unknown offset in buffer of unknown size, so may be outside bounds."

It seemed that there're not much information to resolve the warning. Can I have more detailed explanation on this ?