Looking for references from the early Church Fathers on Galatians 3:13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree: [Galatians 3:13, KJV]


...As it relates to a Luther(esque) view of justification... which largely hinges on this verse. 
 I have found some good stuff from John Chrysostom, but besides that, I am having a difficult time.
Clement of Rome and Polycarp are the earliest church fathers and are known as the Apostolic Fathers.  After them came Irenaeus, Ignatius and Justin Martyr, the Ante-Nicene Fathers (pre 325 A.D.)  Clement’s first letter to the Corinthians (circa 96 A.D.) makes reference to several canonical books including Genesis, Romans, Galatians, Ephesians, 1 Corinthians and Philippians.
Although I could not find a specific reference to Galatians 3:13, in 1 Clement 32:4 there is possibly one of the earliest patristic references to the biblical doctrine of justification through faith alone:

1 Clem 32:4: And so we, having been called through His will in Christ Jesus, are not justified through ourselves or through our own wisdom or understanding or piety or works which we wrought in holiness of heart, but through faith, whereby the Almighty God justified all men that have been from the beginning; to whom be the glory for ever and ever. Amen.  Source: http://www.earlychristianwritings.com/text/1clement-lightfoot.html

I hope this may be of some use to you.