linux-kernel - Re: [74/74] net: fix rds

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Message-ID: <20110415172645.GA11669@suse.de>
Date:	Fri, 15 Apr 2011 10:26:45 -0700
From:	Greg KH <gregkh@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Andy Grover <andy.grover@...cle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [74/74] net: fix rds_iovec page count overflow

On Fri, Apr 15, 2011 at 10:10:13AM -0700, Linus Torvalds wrote:
> On Wed, Apr 13, 2011 at 8:51 AM, Greg KH <gregkh@...e.de> wrote:
> > +
> > +               /*
> > +                * nr_pages for one entry is limited to (UINT_MAX>>PAGE_SHIFT)+1,
> > +                * so tot_pages cannot overflow without first going negative.
> > +                */
> > +               if ((int)nr_pages < 0)
> > +                       ret = -EINVAL;
> > +                       goto out;
> >        }
> 
> Yeah, what the heck happened there. That won't work.
> 
> As Paul says, the original was just a "return -EINVAL", and when the
> backport changed it into a "ret = " + "goto out", it really needs a
> couple of braces.
> 
> As it is, the patch is just broken. Think about it.

Ah crap, that's my fault, I did the backport totally wrong here.

I'll fix this up and push an updated version out in a few hours when I
get back from my daughter's earth-day field trip...

thanks,

greg k-h
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