- ff = kzalloc(sizeof(struct ff_device) +
- max_effects * sizeof(struct file *), GFP_KERNEL);
+ ff_dev_size = sizeof(struct ff_device) +
+ max_effects * sizeof(struct file *);
+ if (ff_dev_size < max_effects) /* overflow */
+ return -EINVAL;
+
+ ff = kzalloc(ff_dev_size, GFP_KERNEL);