When the "grow" option isn't checked, the crop area doesn't respect aspect ratio/vertical/horizontal lock when dragging the area to the limits of the canvas. It will ignore those locks and proceed to resize the area in the direction the mouse is moving.
It won't allow cropping an image keeping the aspect ratio, for instance, if you mean to crop it from one of the edges.

Reproducible: Always

Steps to Reproduce:
1.Select crop tool, uncheck "grow", check "ratio",and/or  "height", and/or "width"
2.Drag the crop area towards the canvas' edges
Actual Results:  
The locked values change.

Expected Results:  
Not ignore the locked options while keeping the crop area within limits.