int ecryptfs_destroy_crypto(void)
{
	struct ecryptfs_key_tfm *key_tfm, *key_tfm_tmp;

	mutex_lock(&key_tfm_list_mutex);
	list_for_each_entry_safe(key_tfm, key_tfm_tmp, &key_tfm_list,
				 key_tfm_list) {
		list_del(&key_tfm->key_tfm_list);
		if (key_tfm->key_tfm)
			crypto_free_blkcipher(key_tfm->key_tfm);
		kmem_cache_free(ecryptfs_key_tfm_cache, key_tfm);
	}
	mutex_unlock(&key_tfm_list_mutex);
	return 0;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.