static int params_from_supp()

in tee_core.c [732:776]

• 32 lines of code
• 8 McCabe index (conditional complexity)

static int params_from_supp(struct tee_param *params, size_t num_params,
			    struct tee_ioctl_param __user *uparams)
{
	size_t n;

	for (n = 0; n < num_params; n++) {
		struct tee_param *p = params + n;
		struct tee_ioctl_param ip;

		if (copy_from_user(&ip, uparams + n, sizeof(ip)))
			return -EFAULT;

		/* All unused attribute bits has to be zero */
		if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
			return -EINVAL;

		p->attr = ip.attr;
		switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
		case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
		case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
			/* Only out and in/out values can be updated */
			p->u.value.a = ip.a;
			p->u.value.b = ip.b;
			p->u.value.c = ip.c;
			break;
		case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
		case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
			/*
			 * Only the size of the memref can be updated.
			 * Since we don't have access to the original
			 * parameters here, only store the supplied size.
			 * The driver will copy the updated size into the
			 * original parameters.
			 */
			p->u.memref.shm = NULL;
			p->u.memref.shm_offs = 0;
			p->u.memref.size = ip.b;
			break;
		default:
			memset(&p->u, 0, sizeof(p->u));
			break;
		}
	}
	return 0;
}