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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43ead402ee8sm8339591f8f.37.2026.04.15.15.23.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2026 15:23:51 -0700 (PDT) From: Tristan Madani To: Johannes Berg Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/3] wifi: ath6kl: fix OOB read from firmware IE lengths in connect event Date: Wed, 15 Apr 2026 22:23:48 +0000 Message-ID: <20260415222349.1541181-3-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260415222349.1541181-1-tristmd@gmail.com> References: <20260415222349.1541181-1-tristmd@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani The firmware-controlled beacon_ie_len, assoc_req_len, and assoc_resp_len fields in ath6kl_wmi_connect_event_rx() are not validated against the buffer length. Their sum (up to 765) can exceed the actual WMI event data, causing out-of-bounds reads during IE parsing and state corruption of wmi->is_wmm_enabled. Add a check that the total IE length fits within the buffer. Fixes: bdcd81707973 ("Add ath6kl cleaned up driver") Signed-off-by: Tristan Madani --- drivers/net/wireless/ath/ath6kl/wmi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c index XXXXXXX..XXXXXXX 100644 --- a/drivers/net/wireless/ath/ath6kl/wmi.c +++ b/drivers/net/wireless/ath/ath6kl/wmi.c @@ -860,6 +860,13 @@ static int ath6kl_wmi_connect_event_rx(struct wmi *wmi, u8 *datap, int len, ev = (struct wmi_connect_event *) datap; + if (len < sizeof(*ev) + ev->beacon_ie_len + + ev->assoc_req_len + ev->assoc_resp_len) { + ath6kl_dbg(ATH6KL_DBG_WMI, + "connect event: IE lengths %u+%u+%u exceed buffer %d\n", + ev->beacon_ie_len, ev->assoc_req_len, + ev->assoc_resp_len, len); + return -EINVAL; + } if (vif->nw_type == AP_NETWORK) { /* AP mode start/STA connected event */ struct net_device *dev = vif->ndev;