Void pointers: Difference between c and c++

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I'm trying to understand the differences between C and C++ with regards to void pointers. the following compiles in C but not C++ :
int* p = malloc(sizeof(int));

However, here:
void foo(void* vptr)
{
}


int main()
{
    int* p = (int*) malloc(sizeof(int));
    foo(p);
    return 0;
}
Both C++ and C compile it with no complain. Why?
 

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