Smith, 24, is a 6-foot-2 point guard and spent last season with the Trail Blazers, appearing in 37 games and averaging 5.6 points and 3.6 assists. The Blazers waived him Feb. 21 and he has been an unrestricted free agent since.
The No. 9 overall pick in the 2017 NBA Draft by the Mavs, he has also spent time with the Knicks and Pistons.
Dallas is on the lookout for another guard after Jalen Brunson left for the Knicks in free agency, so perhaps a door is opening for Smith to return.