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

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Message-ID: <851802c967b92b5ea2ce93e8577107acd43d2034.camel@sipsolutions.net>
Date: Thu, 08 Jan 2026 11:29:23 +0100
From: Johannes Berg <johannes@...solutions.net>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>,  Jakub Kicinski	 <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>
Cc: 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, 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?

johannes