linux-kernel - Re: [PATCH] wifi: mac80211: fix NULL pointer dereference in ieee80211_mesh_build

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Message-ID: <35581fc687d151b2b4fabccb6952d567cac65240.camel@sipsolutions.net>
Date: Tue, 20 Jan 2026 09:12:31 +0100
From: Johannes Berg <johannes@...solutions.net>
To: Jeongjun Park <aha310510@...il.com>
Cc: linux-wireless@...r.kernel.org, 
	syzbot+81cd9dc1596563141d19@...kaller.appspotmail.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: mac80211: fix NULL pointer dereference in
 ieee80211_mesh_build_beacon()

On Tue, 2026-01-20 at 00:00 +0900, Jeongjun Park wrote:
> NULL pointer dereference bug occurs because ieee80211_mesh_build_beacon()
> does not check the return value of ieee80211_get_sband().
> 
> Therefore, we need to add a return value check to prevent this.

No we don't, please try to understand the code, and why it can even get
here when the mesh interface isn't operating.

johannes