linux-kernel - Re: usb/serial/visor: slab-out-of-bounds in palm_os_3

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Date:   Thu, 19 Oct 2017 13:43:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Johan Hovold <johan@...nel.org>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/serial/visor: slab-out-of-bounds in palm_os_3_probe

On Thu, Oct 19, 2017 at 01:19:13PM +0200, Andrey Konovalov wrote:
> On Wed, Oct 4, 2017 at 4:40 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> > On Tue, Oct 03, 2017 at 11:29:40AM +0200, Johan Hovold wrote:
> >> On Fri, Sep 29, 2017 at 10:37:55AM +0200, Greg Kroah-Hartman wrote:
> >> > On Thu, Sep 28, 2017 at 07:57:46PM +0200, Andrey Konovalov wrote:
> >> > > Hi!
> >> > >
> >> > > I've got the following report while fuzzing the kernel with syzkaller.
> >> > >
> >> > > On commit dc972a67cc54585bd83ad811c4e9b6ab3dcd427e (4.14-rc2+).
> >> > >
> >> > > There's no check on the connection_info->num_ports value when
> >> > > iterating over ports.
> >> > >
> >> > > usb 1-1: Handspring Visor / Palm OS: port 162, is for unknown use
> >> > > usb 1-1: Handspring Visor / Palm OS: port 81, is for unknown use
> >> > > ==================================================================
> >> > > BUG: KASAN: slab-out-of-bounds in palm_os_3_probe+0x4e4/0x570
> >> > > Read of size 1 at addr ffff8800686daa26 by task kworker/0:1/24
> >>
> >> Thanks for the report, Andrey.
> >>
> >> > Ah, nice catch, this bug is _old_, sorry about that.
> >> >
> >> > The patch below should resolve this.  It looks bigger than it really is,
> >> > as I'm just moving the error checking higher up in the function, and
> >> > loosing an indentation for when there is invalid data.
> >> >
> >> > Can you let me know if this solves the issue?
> >>
> >> And thanks for fixing this up, Greg. Will you send a proper patch that I
> >> can apply?
> >
> > Yes, let me redo it based on your comments, and will send it out
> > "correctly" in a few days.
> 
> Hi Greg,
> 
> I was going through the bugs I've reported, and it seems that you
> didn't mail the patch for this one. Reminding in case you've
> accidentally forgotten about it.

It's not forgotten, it's on my TODO list, sorry, been swamped with other
things these past few weeks.  Hope to get to it soon...

thanks,

greg k-h