static int from_msg_param_tmp_mem()

in optee/smc_abi.c [54:89]

• 29 lines of code
• 5 McCabe index (conditional complexity)

static int from_msg_param_tmp_mem(struct tee_param *p, u32 attr,
				  const struct optee_msg_param *mp)
{
	struct tee_shm *shm;
	phys_addr_t pa;
	int rc;

	p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
		  attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
	p->u.memref.size = mp->u.tmem.size;
	shm = (struct tee_shm *)(unsigned long)mp->u.tmem.shm_ref;
	if (!shm) {
		p->u.memref.shm_offs = 0;
		p->u.memref.shm = NULL;
		return 0;
	}

	rc = tee_shm_get_pa(shm, 0, &pa);
	if (rc)
		return rc;

	p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
	p->u.memref.shm = shm;

	/* Check that the memref is covered by the shm object */
	if (p->u.memref.size) {
		size_t o = p->u.memref.shm_offs +
			   p->u.memref.size - 1;

		rc = tee_shm_get_pa(shm, o, NULL);
		if (rc)
			return rc;
	}

	return 0;
}