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[213.36.7.13]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-499d63771c2sm1195245e9.15.2026.08.24.09.27.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Aug 2026 09:27:27 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Mon, 24 Aug 2026 18:27:27 +0200 Message-Id: Cc: , , Subject: Re: [PATCH] wifi: mac80211: mesh: free pending CSA settings on interface stop From: "Nicolas Escande" To: "Deepanshu Kartikey" , X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260824054611.29728-1-kartikey406@gmail.com> In-Reply-To: <20260824054611.29728-1-kartikey406@gmail.com> On Mon Aug 24, 2026 at 7:46 AM CEST, Deepanshu Kartikey wrote: > ifmsh->csa is allocated in ieee80211_mesh_csa_beacon() and normally > freed in ieee80211_mesh_finish_csa() once the channel switch > completes. If the mesh interface is stopped while a channel switch > is still in progress, ifmsh->csa is never freed, leaking the > mesh_csa_settings object. > > Free it in ieee80211_stop_mesh(), the same way ifmsh->beacon is > already handled there. > > Reported-by: syzbot+f5752cd6b94fe38be666@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=3Df5752cd6b94fe38be666 > Tested-by: syzbot+f5752cd6b94fe38be666@syzkaller.appspotmail.com > Signed-off-by: Deepanshu Kartikey > --- > net/mac80211/mesh.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c > index d4507e4e6ec1..d3fb4478a366 100644 > --- a/net/mac80211/mesh.c > +++ b/net/mac80211/mesh.c > @@ -1201,7 +1201,8 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_da= ta *sdata) > struct ieee80211_local *local =3D sdata->local; > struct ieee80211_if_mesh *ifmsh =3D &sdata->u.mesh; > struct beacon_data *bcn; > - > + struct mesh_csa_settings *csa; > + > netif_carrier_off(sdata->dev); > =20 > /* flush STAs and mpaths on this iface */ > @@ -1222,6 +1223,13 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_d= ata *sdata) > RCU_INIT_POINTER(ifmsh->beacon, NULL); > kfree_rcu(bcn, rcu_head); > =20 > + /* free any pending, unfinished channel switch */ > + csa =3D sdata_dereference(ifmsh->csa, sdata); > + if (csa) { > + RCU_INIT_POINTER(ifmsh->csa, NULL); > + kfree_rcu(csa, rcu_head); > + } > + Why not really handling it like the beacon data and just remove the if ? csa =3D sdata_dereference(ifmsh->csa, sdata); RCU_INIT_POINTER(ifmsh->csa, NULL); kfree_rcu(csa, rcu_head); Should do the same: - RCU_INIT_POINTER() will not take too much time - kfree_rcu() already does a null check > /* free all potentially still buffered group-addressed frames */ > local->total_ps_buffered -=3D skb_queue_len(&ifmsh->ps.bc_buf); > skb_queue_purge(&ifmsh->ps.bc_buf); Thanks