linux-kernel - Re: [PATCH v2] wifi: mac80211: Avoid address calculations via out of bounds array indexing

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Date: Tue, 04 Jun 2024 21:29:57 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Kenton Groombridge <concord@...too.org>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com,  linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
  linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, Kees Cook
 <keescook@...omium.org>
Subject: Re: [PATCH v2] wifi: mac80211: Avoid address calculations via out
 of bounds array indexing

On Tue, 2024-06-04 at 14:53 -0400, Kenton Groombridge wrote:
> On 24/05/29 04:54PM, Johannes Berg wrote:
> > On Fri, 2024-05-17 at 10:54 -0400, Kenton Groombridge wrote:
> > > req->n_channels must be set before req->channels[] can be used.
> > > 
> > 
> > I don't know why, but this patch breaks a number of hwsim test cases.
> > 
> > https://w1.fi/cgit/hostap/tree/tests/hwsim/
> > 
> > johannes
> 
> Pardon my absence.
> 
> I'm also not sure why these tests are failing. Unless I'm missing
> something, the runtime behavior of these code paths shouldn't have
> changed significantly.
> 

Looking at your patch again, this seems wrong?

> +				local->hw_scan_req->req.channels[*n_chans++] =
>  							req->channels[i];
> 

This will increment n_chans rather than *n_chans, no?

johannes