The official errata list is at Bell Labs (or whatever they want to call it this week). The last time I looked at it it was marked as `Last modified: September 7, 1998' but I know that Dennis Ritchie updated it on 29 October 1998 because he told me so.
There are at least two other official errata lists for K&R II (the second edition of The C Programming Language aka The New Testament). I have the 31 Jan 1991 and July 1992 versions in text form at UWO (in Canada) and a link to the HTML version at the C archive in Sweden. I'm not sure what differences there are between the version at the C archive and the July 1992 one.
This document is copyright by its author, J. Blustein.