From: Pavel Machek <pavel@denx.de>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Pavel Machek <pavel@denx.de>,
stable@kernel.org, kernel list <linux-kernel@vger.kernel.org>,
gustavo@embeddedor.com, davem@davemloft.net
Subject: Re: net: atm: Spectre v1 fix introduced bug in bcb964012d1b in -stable
Date: Mon, 20 May 2019 18:15:42 +0200 [thread overview]
Message-ID: <20190520161541.GA25789@amd> (raw)
In-Reply-To: <20190520140007.GA6397@kroah.com>
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On Mon 2019-05-20 16:00:07, Greg KH wrote:
> On Mon, May 20, 2019 at 02:40:14PM +0200, Pavel Machek wrote:
> >
> > In lecd_attach, if arg is < 0, it was treated as 0. Spectre v1 fix
> > changed that. Bug does not exist in mainline AFAICT.
> >
> > Signed-off-by: Pavel Machek <pavel@denx.de>
> > # for 4.19.y
> >
> > diff --git a/net/atm/lec.c b/net/atm/lec.c
> > index ad4f829193f0..ed279cd912f4 100644
> > --- a/net/atm/lec.c
> > +++ b/net/atm/lec.c
> > @@ -731,7 +731,7 @@ static int lecd_attach(struct atm_vcc *vcc, int arg)
> > i = arg;
> > if (arg >= MAX_LEC_ITF)
> > return -EINVAL;
> > - i = array_index_nospec(arg, MAX_LEC_ITF);
> > + i = array_index_nospec(i, MAX_LEC_ITF);
> > if (!dev_lec[i]) {
> > int size;
> >
>
> Why is this only for 4.19.y? What is different in Linus's tree that
> makes this not needed there?
Mainline sanitizes "arg", 4.19 copies "arg" into "i" then sanitizes
it. Take a look, it is local to the function.
Pavel
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next prev parent reply other threads:[~2019-05-20 16:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 12:40 net: atm: Spectre v1 fix introduced bug in bcb964012d1b in -stable Pavel Machek
2019-05-20 14:00 ` Greg KH
2019-05-20 14:26 ` Gustavo A. R. Silva
2019-05-20 21:00 ` Pavel Machek
2019-05-20 16:15 ` Pavel Machek [this message]
2019-05-20 14:15 ` Gustavo A. R. Silva
2019-05-20 16:15 ` Pavel Machek
2019-05-20 16:54 ` Gustavo A. R. Silva
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