am 9bd7afc0: Prevent integer overflow when allocating native_handle_t

#include <cutils/log.h>

#include <cutils/native_handle.h>

static const int kMaxNativeFds = 1024;

static const int kMaxNativeInts = 1024;

native_handle_t* native_handle_create(int numFds, int numInts)

{

    native_handle_t* h = malloc(

            sizeof(native_handle_t) + sizeof(int)*(numFds+numInts));

    if (numFds < 0 || numInts < 0 || numFds > kMaxNativeFds || numInts > kMaxNativeInts) {

        return NULL;

    }

    size_t mallocSize = sizeof(native_handle_t) + (sizeof(int) * (numFds + numInts));

    native_handle_t* h = malloc(mallocSize);

    if (h) {

        h->version = sizeof(native_handle_t);

        h->numFds = numFds;

        h->numInts = numInts;

    }

    return h;

}