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Mon, 24 Aug 2026 08:57:43 -0700 (PDT) Received: from localhost.localdomain ([101.251.7.10]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327f91d37cesm32210430eec.15.2026.08.24.08.57.40 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 24 Aug 2026 08:57:43 -0700 (PDT) From: Laxman Acharya Padhya To: linux-bluetooth@vger.kernel.org Cc: Luiz Augusto von Dentz , Marcel Holtmann , linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v2] Bluetooth: hci_codec: validate vendor codec count length Date: Mon, 24 Aug 2026 21:42:36 +0545 Message-ID: <20260824155736.54542-1-acharyalaxman8848@gmail.com> X-Mailer: git-send-email 2.51.2 In-Reply-To: References: <20260823161638.32348-1-acharyalaxman8848@gmail.com> <20260824144051.50010-1-acharyalaxman8848@gmail.com> <20260824152029.51492-1-acharyalaxman8848@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" 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. Use skb_pull_data() to validate and consume each codec header 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 Suggested-by: Luiz Augusto von Dentz Signed-off-by: Laxman Acharya Padhya --- Changes in v2: - Use skb_pull_data() to validate and consume the standard and vendor codec headers before accessing their counts, as suggested by Luiz. net/bluetooth/hci_codec.c | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/net/bluetooth/hci_codec.c b/net/bluetooth/hci_codec.c index 5bc5003c387c..7a7e813dcdda 100644 --- a/net/bluetooth/hci_codec.c +++ b/net/bluetooth/hci_codec.c @@ -145,11 +145,12 @@ void hci_read_supported_codecs(struct hci_dev *hdev) =20 skb_pull(skb, sizeof(rp->status)); =20 - std_codecs =3D (void *)skb->data; + std_codecs =3D skb_pull_data(skb, sizeof(*std_codecs)); + if (!std_codecs) + goto error; =20 /* validate codecs length before accessing */ - if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num) - + sizeof(std_codecs->num)) + if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)) goto error; =20 /* enumerate codec capabilities of standard codecs */ @@ -161,15 +162,14 @@ void hci_read_supported_codecs(struct hci_dev *hdev) LOCAL_CODEC_ACL_MASK | LOCAL_CODEC_SCO_MASK, &caps); } =20 - skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num) - + sizeof(std_codecs->num)); + skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)); =20 - vnd_codecs =3D (void *)skb->data; + vnd_codecs =3D skb_pull_data(skb, sizeof(*vnd_codecs)); + if (!vnd_codecs) + goto error; =20 /* validate vendor codecs length before accessing */ - if (skb->len < - flex_array_size(vnd_codecs, codec, vnd_codecs->num) - + sizeof(vnd_codecs->num)) + if (skb->len < flex_array_size(vnd_codecs, codec, vnd_codecs->num)) goto error; =20 /* enumerate vendor codec capabilities */ @@ -214,11 +214,12 @@ void hci_read_supported_codecs_v2(struct hci_dev *hde= v) =20 skb_pull(skb, sizeof(rp->status)); =20 - std_codecs =3D (void *)skb->data; + std_codecs =3D skb_pull_data(skb, sizeof(*std_codecs)); + if (!std_codecs) + goto error; =20 /* check for payload data length before accessing */ - if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num) - + sizeof(std_codecs->num)) + if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num)) goto error; =20 memset(&caps, 0, sizeof(caps)); @@ -229,15 +230,14 @@ void hci_read_supported_codecs_v2(struct hci_dev *hde= v) &caps); } =20 - skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num) - + sizeof(std_codecs->num)); + skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num)); =20 - vnd_codecs =3D (void *)skb->data; + vnd_codecs =3D skb_pull_data(skb, sizeof(*vnd_codecs)); + if (!vnd_codecs) + goto error; =20 /* check for payload data length before accessing */ - if (skb->len < - flex_array_size(vnd_codecs, codec, vnd_codecs->num) - + sizeof(vnd_codecs->num)) + if (skb->len < flex_array_size(vnd_codecs, codec, vnd_codecs->num)) goto error; =20 for (i =3D 0; i < vnd_codecs->num; i++) { --=20 2.51.2