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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.
This commit is contained in:
dsl 2009-10-11 17:20:48 +00:00
parent a5cf1bb4b7
commit 65dd100015
1 changed files with 5 additions and 2 deletions
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7
sys/kern/tty.c
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@ -1,4 +1,4 @@
/* $NetBSD: tty.c,v 1.233 2009/10/02 23:58:53 elad Exp $ */ /* $NetBSD: tty.c,v 1.234 2009/10/11 17:20:48 dsl Exp $ */
/*- /*-
* Copyright (c) 2008 The NetBSD Foundation, Inc. * Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -63,7 +63,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.233 2009/10/02 23:58:53 elad Exp $"); __KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.234 2009/10/11 17:20:48 dsl Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -1669,6 +1669,9 @@ ttread(struct tty *tp, struct uio *uio, int flag)
long lflag, slp; long lflag, slp;
struct timeval now, stime; struct timeval now, stime;
if (uio->uio_resid == 0)
return 0;
stime.tv_usec = 0; /* XXX gcc */ stime.tv_usec = 0; /* XXX gcc */
stime.tv_sec = 0; /* XXX gcc */ stime.tv_sec = 0; /* XXX gcc */