linux-kernel - Re: [PATCH] Fix kobject uevent string handling errors

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Message-ID: <20070825183833.GA2000@Krystal>
Date:	Sat, 25 Aug 2007 14:38:34 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix kobject uevent string handling errors

* Kay Sievers (kay.sievers@...y.org) wrote:
 >  	env->envp[env->envp_idx++] = &env->buf[env->buflen];
> >  	env->buflen += len + 1;
> > Index: linux-2.6-lttng/drivers/firmware/dmi-id.c
> > ===================================================================
> > --- linux-2.6-lttng.orig/drivers/firmware/dmi-id.c	2007-08-25 00:07:24.000000000 -0400
> > +++ linux-2.6-lttng/drivers/firmware/dmi-id.c	2007-08-25 00:07:58.000000000 -0400
> > @@ -152,9 +152,10 @@ static int dmi_dev_uevent(struct device 
> >  	if (add_uevent_var(env, "MODALIAS="))
> >  		return -ENOMEM;
> >  	len = get_modalias(&env->buf[env->buflen - 1],
> > -			   sizeof(env->buf) - env->buflen);
> > -	if (len >= (sizeof(env->buf) - env->buflen))
> > +			   sizeof(env->buf) - (env->buflen - 1));
> > +	if (len >= (sizeof(env->buf) - (env->buflen - 1)))
> >  		return -ENOMEM;
> > +	env->buflen += len + 1;
> 
> The increment for the trailing '\0' is already done in add_uevent_var(),
> so this change is not needed, I think.

Oh, you are right, since we replace the existing \0 which is already
accounted for, we don't have to do len +1 here.

Thanks,

Mathieu


-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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