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Wed, 05 Aug 2026 10:37:25 -0700 (PDT) Received: from localhost.localdomain ([2405:acc0:1306:9d5b:70f2:9802:a2e4:b516]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13fca50acddsm16109750c88.3.2026.08.05.10.37.23 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 05 Aug 2026 10:37:25 -0700 (PDT) From: Laxman Acharya To: Luiz Augusto von Dentz , Marcel Holtmann Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, Laxman Acharya Subject: [PATCH] Bluetooth: hci_event: fix out-of-bounds read in LE PA report reassembly Date: Wed, 5 Aug 2026 23:22:01 +0545 Message-ID: <20260805173701.6649-1-acharyalaxman8848@gmail.com> X-Mailer: git-send-email 2.51.2 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" hci_le_per_adv_report_evt() is dispatched with a minimum length of sizeof(struct hci_ev_le_per_adv_report), which only covers the fixed part of the event and not the trailing data[] array: struct hci_ev_le_per_adv_report { __le16 sync_handle; __u8 tx_power; __u8 rssi; __u8 cte_type; __u8 data_status; __u8 length; __u8 data[]; } __packed; The handler notifies the ISO layer via hci_proto_connect_ind(), which reaches iso_connect_ind(). That function retrieves the stored event with hci_recv_event_data() and, while reassembling the periodic advertising data, does: memcpy(hcon->le_per_adv_data + hcon->le_per_adv_data_offset, ev->data, ev->length); ev->length is taken directly from the event and is never validated against the amount of data the event actually carries. A controller that reports a length larger than the received event therefore causes the memcpy() to read past the end of the event buffer. The leaked bytes are stored in hcon->le_per_adv_data and can subsequently be read back from user space via getsockopt(BT_ISO_BASE). Validate that the event contains ev->length data bytes before it is consumed, mirroring the check already performed by hci_le_ext_adv_report_evt() and hci_le_adv_report_evt(). Signed-off-by: Laxman Acharya --- net/bluetooth/hci_event.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 741d658e9..727545e0c 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -6604,6 +6604,13 @@ static void hci_le_per_adv_report_evt(struct hci_dev= *hdev, void *data, =20 bt_dev_dbg(hdev, "sync_handle 0x%4.4x", le16_to_cpu(ev->sync_handle)); =20 + /* The reassembly in iso_connect_ind() copies ev->length bytes from the + * stored event, so make sure the event actually carries that many data + * bytes before it is consumed. + */ + if (!hci_le_ev_skb_pull(hdev, skb, HCI_EV_LE_PER_ADV_REPORT, ev->length)) + return; + hci_dev_lock(hdev); =20 mask |=3D hci_proto_connect_ind(hdev, BDADDR_ANY, PA_LINK, &flags); --=20 2.51.2