Canon Love is love of the canon. It is produced by honoring the canon, through general enjoyment and love of it, and writing goodfic.
The concentrated presence of Canon Love can in fact halt and reverse the effects of canon distortion. Such may include the oft-mentioned "author spinning in their grave"; thus, Canon Love is one of the main causes of blackouts in HQ, due to the way the Department of Dead Author Electricity Generation works.
Canon Love has also been known to be weaponized; well-made fanworks can be used in exorcisms as a substitute for canon material, as shown here. Note that it was partly necessary in this instance; the continuum involved, Five Nights at Freddy's, has no physical canon material.