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Sun, 23 Aug 2026 09:16:47 -0700 (PDT) Received: from localhost.localdomain ([101.251.7.10]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327f91d33dcsm22288251eec.18.2026.08.23.09.16.43 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 23 Aug 2026 09:16:46 -0700 (PDT) From: Laxman Acharya Padhya To: linux-bluetooth@vger.kernel.org Cc: Marcel Holtmann , Luiz Augusto von Dentz , linux-kernel@vger.kernel.org, Laxman Acharya Padhya , stable@vger.kernel.org Subject: [PATCH] Bluetooth: hci_codec: validate vendor codec count length Date: Sun, 23 Aug 2026 22:01:38 +0545 Message-ID: <20260823161638.32348-1-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" The Read Local Supported Codecs parsers consume the variable-sized standard codec array before parsing the vendor codec count. Although the initial reply-size check includes a vendor count byte in the fixed layout, it does not guarantee that the byte remains after the standard codec array. If a controller reply ends immediately after that array, calculating the vendor codec array size reads vnd_codecs->num beyond the skb data. Require the vendor codec header to be present before using its count in both command variants. Fixes: 8961987f3f5f ("Bluetooth: Enumerate local supported codec and cache = details") Fixes: 9ae664028a9e ("Bluetooth: Add support for Read Local Supported Codec= s V2") Cc: stable@vger.kernel.org Signed-off-by: Laxman Acharya Padhya --- net/bluetooth/hci_codec.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/bluetooth/hci_codec.c b/net/bluetooth/hci_codec.c index 5bc5003c387c..99394a3348c7 100644 --- a/net/bluetooth/hci_codec.c +++ b/net/bluetooth/hci_codec.c @@ -165,6 +165,8 @@ void hci_read_supported_codecs(struct hci_dev *hdev) + sizeof(std_codecs->num)); =20 vnd_codecs =3D (void *)skb->data; + if (skb->len < sizeof(*vnd_codecs)) + goto error; =20 /* validate vendor codecs length before accessing */ if (skb->len < @@ -233,6 +235,8 @@ void hci_read_supported_codecs_v2(struct hci_dev *hdev) + sizeof(std_codecs->num)); =20 vnd_codecs =3D (void *)skb->data; + if (skb->len < sizeof(*vnd_codecs)) + goto error; =20 /* check for payload data length before accessing */ if (skb->len < --=20 2.50.1