kernel-hardening - Re: [PATCH v6 3/5] rxrpc: check return value of skb_to

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Fri, 28 Apr 2017 15:29:45 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Sabrina Dubroca <sd@...asysnail.net>
Cc: Netdev <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	David Laight <David.Laight@...lab.com>, kernel-hardening@...ts.openwall.com, 
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH v6 3/5] rxrpc: check return value of skb_to_sgvec always

Hi Sabrina,

Thanks for the review.

On Fri, Apr 28, 2017 at 1:41 PM, Sabrina Dubroca <sd@...asysnail.net> wrote:
> >       sg_init_table(sg, nsg);
> > -     skb_to_sgvec(skb, sg, offset, len);
> > +     if (unlikely(skb_to_sgvec(skb, sg, offset, len) < 0))
> > +             goto nomem;
>
> You're leaking sg when nsg > 4, you'll need to add this:
>
>         if (sg != _sg)
>                 kfree(sg);

Nice catch. I'll fix this up in the next revision.


>
>
>
> BTW, when you resubmit, please Cc: the maintainers of the files you're
> changing for each patch, so that they can review this stuff. And send
> patch 1 to all of them, otherwise they might be surprised that we even
> need <0 checking after calls to skb_to_sgvec.
>
> You might also want to add a cover letter.

Both good ideas. Will do.

Jason

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.