netdev - Re: [PATCH net] wifi: avoid kernel-infoleak from struct iw

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Message-ID: <CANn89iLxDc9viP0Pmj3uC01s46eUR2xu4XAUEo=he-M84aCf9A@mail.gmail.com>
Date: Thu, 8 Jan 2026 11:32:04 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Johannes Berg <johannes@...solutions.net>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, syzbot+bfc7323743ca6dbcc3d3@...kaller.appspotmail.com, 
	stable@...r.kernel.org
Subject: Re: [PATCH net] wifi: avoid kernel-infoleak from struct iw_point

On Thu, Jan 8, 2026 at 11:29 AM Johannes Berg <johannes@...solutions.net> wrote:
>
> On Thu, 2026-01-08 at 10:19 +0000, Eric Dumazet wrote:
> > struct iw_point has a 32bit hole on 64bit arches.
> >
> > struct iw_point {
> >   void __user   *pointer;       /* Pointer to the data  (in user space) */
> >   __u16         length;         /* number of fields or size in bytes */
> >   __u16         flags;          /* Optional params */
> > };
> >
> > Make sure to zero the structure to avoid dislosing 32bits of kernel data
> > to user space.
>
> Heh, wow. Talk about old code.
>
> > Reported-by: syzbot+bfc7323743ca6dbcc3d3@...kaller.appspotmail.com
> > https://lore.kernel.org/netdev/695f83f3.050a0220.1c677c.0392.GAE@google.com/T/#u
>
> Was that intentionally without Link: or some other tag?

Somehow the Closes: prefix has been lost when I cooked the patch.

Closes: https://lore.kernel.org/netdev/695f83f3.050a0220.1c677c.0392.GAE@google.com/T/#u

Let me know if you want a V2, thanks.

>
> johannes