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Error out of ptcread() if the uio length supplied is zero before the code

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has a chance to panic in ureadc().
This commit is contained in:
dsl 2009-10-14 19:25:39 +00:00
parent a9cd93a788
commit 931ac5949a
1 changed files with 5 additions and 2 deletions
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7
sys/kern/tty_pty.c
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@ -1,4 +1,4 @@
/* $NetBSD: tty_pty.c,v 1.118 2009/10/11 08:08:32 dsl Exp $ */
/* $NetBSD: tty_pty.c,v 1.119 2009/10/14 19:25:39 dsl Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.118 2009/10/11 08:08:32 dsl Exp $");
__KERNEL_RCSID(0, "$NetBSD: tty_pty.c,v 1.119 2009/10/14 19:25:39 dsl Exp $");
#include "opt_ptm.h"
@ -586,6 +586,9 @@ ptcread(dev_t dev, struct uio *uio, int flag)
int error = 0, cc;
int c;
if (uio->uio_resid <= 0)
return EINVAL;
/*
* We want to block until the slave
* is open, and there's something to read;