There are a few issues with the native memory allocation in share/native/sun/security/smartcardio/pcsc.c:

1)
    readerState = calloc(readers, sizeof(SCARD_READERSTATE));
    if (readerState == NULL) {
        throwOutOfMemoryError(env, NULL);

calloc() can return NULL due to readers be zero.
In this case OOM would be confusing.

2)
    for (i = 0; i < readers; i++) {
        free((char *)readerState[i].szReader);
    }

We can get here upon an error, so readerState[i].szReader may not be initialized.

3)
    mszReaders = malloc(size);
    if (mszReaders == NULL) {
        throwOutOfMemoryError(env, NULL);
        return NULL;
    }

If size happens to be zero, we'll get a confusing OOM.

4)
    tab = (char **)malloc(cnt * sizeof(char *));
    if (tab == NULL) {
        throwOutOfMemoryError(env, NULL);
        return NULL;
    }

Again, we can get NULL from malloc, if cnt == 0.