linux-kernel - Re: [PATCH] wifi: cfg80211: Lock wiphy in cfg80211_get

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Date: Tue, 21 May 2024 09:12:26 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Remi Pommarel <repk@...plefau.lt>
Cc: Antonio Quartulli <antonio@...n-mesh.com>,
 linux-wireless@...r.kernel.org,  b.a.t.m.a.n@...ts.open-mesh.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: cfg80211: Lock wiphy in cfg80211_get_station

On Sat, 2024-05-18 at 17:50 +0200, Remi Pommarel wrote:
> Wiphy should be locked before calling rdev_get_station() (see lockdep
> assert in ieee80211_get_station()).
> 
> This fixes the following kernel NULL dereference:

How do you get a NULL pointer dereference from a locking issue? Was
something else removing the station simultaneously?

johannes