linux-kernel - Re: state machine defect in drivers/tty/vt/vt.c?

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Message-ID: <m2vcvac8dt.fsf@igel.home>
Date:	Sun, 10 Jul 2011 20:12:30 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: state machine defect in drivers/tty/vt/vt.c?

Joe Perches <joe@...ches.com> writes:

> vc->vc_state is sequentially set to different values.
>
> Looks like there's either a return or a break
> missing at the end of case ESgetpars:
>
> Anyone know the right fix here?

The first assignment can be removed.

> 	case ESgetpars:
> 		if (c == ';' && vc->vc_npar < NPAR - 1) {
> 			vc->vc_npar++;
> 			return;
> 		} else if (c>='0' && c<='9') {
> 			vc->vc_par[vc->vc_npar] *= 10;
> 			vc->vc_par[vc->vc_npar] += c - '0';
> 			return;
> 		} else
> 			vc->vc_state = ESgotpars;
> 	case ESgotpars:
> 		vc->vc_state = ESnormal;

That handles cases like '\033[m' where '\033[' enters state ESgetpars,
but 'm' is handled by ESgotpars.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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