CVS commit: src/sys/kern

[David Laight <dsl%netbsd.org@localhost>]

Module Name:    src
Committed By:   dsl
Date:           Sun Oct 11 17:20:48 UTC 2009

Modified Files:
        src/sys/kern: tty.c

Log Message:
Check for zero length read here - and return zero.
Most times we've come through spec_read() which has already done the test,
but not always (eg pty with ptsfs mounted).
Without this there is a simple local-user panic in ureadc().
Noted Matthew Mondor on tech-kern.


To generate a diff of this commit:
cvs rdiff -u -r1.233 -r1.234 src/sys/kern/tty.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.