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Mon, 18 May 2026 17:15:29 -0700 (PDT) Received: from node ([202.47.63.86]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bd5c05f36fsm199132645ad.21.2026.05.18.17.15.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 17:15:28 -0700 (PDT) From: Muhammad Bilal To: linux-bluetooth@vger.kernel.org Cc: linux-kernel@vger.kernel.org, marcel@holtmann.org, luiz.dentz@gmail.com, johan.hedberg@gmail.com, pmenzel@molgen.mpg.de, stable@vger.kernel.org, Muhammad Bilal Subject: [PATCH v2] Bluetooth: SMP: add missing skb len check in smp_cmd_keypress_notify Date: Mon, 18 May 2026 20:14:37 -0400 Message-ID: <20260519001437.156400-1-meatuni001@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260517145417.31910-1-meatuni001@gmail.com> References: <20260517145417.31910-1-meatuni001@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: quoted-printable Content-Type: text/plain; charset="utf-8" smp_cmd_keypress_notify() accesses the received payload as struct smp_cmd_keypress_notify without verifying that skb->len contains enough data. smp_sig_channel() removes the opcode byte before dispatching to command handlers, so a SMP_CMD_KEYPRESS_NOTIFY packet without a payload leaves skb->len equal to zero on entry to the handler, causing a 1-byte out-of-bounds read from the heap. Use skb_pull_data() to safely consume the payload; it performs a bounds check internally and returns NULL when the packet is too short. Add a ratelimited warning in that path to aid debugging of malformed packets, matching the pattern used by hci_event.c. Fixes: 1408bb6efb04 ("Bluetooth: Add dummy handler for LE SC keypress notif= ication") Cc: stable@vger.kernel.org Signed-off-by: Muhammad Bilal --- net/bluetooth/smp.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 98f1da4f5..1b237e623 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -2930,7 +2930,15 @@ static int smp_cmd_dhkey_check(struct l2cap_conn *co= nn, struct sk_buff *skb) static int smp_cmd_keypress_notify(struct l2cap_conn *conn, struct sk_buff *skb) { - struct smp_cmd_keypress_notify *kp =3D (void *) skb->data; + struct smp_cmd_keypress_notify *kp; + + kp =3D skb_pull_data(skb, sizeof(struct smp_cmd_keypress_notify)); + if (!kp) { + bt_dev_warn_ratelimited(conn->hcon->hdev, + "Too small packet: skb->len %u < %zu", + skb->len, sizeof(struct smp_cmd_keypress_notify)); + return SMP_INVALID_PARAMS; + } =20 bt_dev_dbg(conn->hcon->hdev, "value 0x%02x", kp->value); =20 --=20 2.54.0