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([2402:f000:4:1006:809:0:a77:18ea]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-819c52f8952sm3361086b3a.39.2026.01.06.19.12.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jan 2026 19:12:17 -0800 (PST) From: Tuo Li To: toke@toke.dk Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Tuo Li Subject: [PATCH] wifi: ath9k: add a defensive NULL check to prevent null-pointer dereference in ath9k_beacon_remove_slot() Date: Wed, 7 Jan 2026 11:12:03 +0800 Message-ID: <20260107031203.170628-1-islituo@gmail.com> X-Mailer: git-send-email 2.43.0 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" In this function, bf is guarded by an if statement, indicating that it may be NULL: if (bf && bf->bf_mpdu) {...} If bf is NULL, calling list_add_tail() may result in a null-pointer dereference: list_add_tail(&bf->list, &sc->beacon.bbuf); Therefore, add a defensive NULL check before invoking list_add_tail() to prevent this issue. Signed-off-by: Tuo Li --- drivers/net/wireless/ath/ath9k/beacon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless= /ath/ath9k/beacon.c index 4a27e3753c03..e39e2738ba1a 100644 --- a/drivers/net/wireless/ath/ath9k/beacon.c +++ b/drivers/net/wireless/ath/ath9k/beacon.c @@ -236,7 +236,8 @@ void ath9k_beacon_remove_slot(struct ath_softc *sc, str= uct ieee80211_vif *vif) =20 avp->av_bcbuf =3D NULL; sc->beacon.bslot[avp->av_bslot] =3D NULL; - list_add_tail(&bf->list, &sc->beacon.bbuf); + if (bf) + list_add_tail(&bf->list, &sc->beacon.bbuf); =20 tasklet_enable(&sc->bcon_tasklet); } --=20 2.43.0