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Wed, 22 Jul 2026 18:09:36 -0700 (PDT) Received: from KRHW1CJW23.bytedance.net ([203.208.189.11]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2cf8f350475sm22649365ad.70.2026.07.22.18.09.33 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 22 Jul 2026 18:09:35 -0700 (PDT) From: Zhao Li To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, lachlan.hodges@morsemicro.com, lorenzo@kernel.org, Zhao Li Subject: [PATCH v2] wifi: mac80211: validate individual TWT params before driver setup Date: Thu, 23 Jul 2026 09:09:28 +0800 Message-ID: <20260723010928.76551-1-enderaoelyther@gmail.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@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" ieee80211_process_rx_twt_action() validates a received S1G TWT setup frame only through the control byte and 2-byte req_type before queueing it. An individual agreement can therefore reach ieee80211_s1g_rx_twt_setup() with twt->length too short for the full struct ieee80211_twt_params. The individual path passes twt to drv_add_twt_setup(). Both the tracepoint and the driver callback consume the complete parameters block, not merely req_type. Do not pass a short individual agreement to the driver. Broadcast agreements remain unchanged because they are rejected locally after accessing only req_type. No in-tree driver both implements .add_twt_setup and exposes S1G operation, so this is a robustness fix rather than a fix for an observed crash. Fixes: f5a4c24e689f ("mac80211: introduce individual TWT support in AP mode= ") Cc: Lachlan Hodges Cc: Lorenzo Bianconi Link: https://lore.kernel.org/all/20260708195911.84365-7-enderaoelyther@gma= il.com/ Assisted-by: Codex:gpt-5 Assisted-by: Claude:opus-4.8 Signed-off-by: Zhao Li --- Changes in v2: - Validate the full parameter block only for individual agreements, leaving broadcast rejection handling unchanged. - Add the relevant driver maintainers. net/mac80211/s1g.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/mac80211/s1g.c b/net/mac80211/s1g.c index 5af4a0c6c642..abc338e22e59 100644 --- a/net/mac80211/s1g.c +++ b/net/mac80211/s1g.c @@ -101,6 +101,10 @@ ieee80211_s1g_rx_twt_setup(struct ieee80211_sub_if_dat= a *sdata, struct ieee80211_twt_setup *twt =3D (void *)mgmt->u.action.s1g.variable; struct ieee80211_twt_params *twt_agrt =3D (void *)twt->params; =20 + if (!(twt->control & IEEE80211_TWT_CONTROL_NEG_TYPE_BROADCAST) && + twt->length < sizeof(twt->control) + sizeof(*twt_agrt)) + return; + twt_agrt->req_type &=3D cpu_to_le16(~IEEE80211_TWT_REQTYPE_REQUEST); =20 /* broadcast TWT not supported yet */ --=20 2.50.1 (Apple Git-155)