linux-hardening - Re: [PATCH 1/1] wifi: mac80211: Avoid address calculations via out of bounds array indexing

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Date: Fri, 17 May 2024 08:25:16 +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, keescook@...omium.org, 
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/1] wifi: mac80211: Avoid address calculations via out
 of bounds array indexing

On Thu, 2024-05-16 at 20:23 -0400, Kenton Groombridge wrote:
> req->n_channels must be set before req->channels[] can be used.
> Additionally, memory addresses after the "channels" array need to be
> calculated from the allocation base ("request") instead of the first
> "out of bounds" index of "channels" to avoid a runtime bounds check
> warning.

Thanks. Can you please drop the cfg80211 parts from this to match the
subject, the code there is broken in other ways too, I have a fix for
all of that:
https://patchwork.kernel.org/project/linux-wireless/patch/20240510113738.4190692ef4ee.I0cb19188be17a8abd029805e3373c0a7777c214c@changeid/

johannes