From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793210860; b=KYOhWnby85/QdDw8KqaFDPwbwp9ZLgBpX9P2L6VS2x4ch9Rzh5vtvasTgt1/Ec0lupNU Hk8IQ0o2TkehZ7LPPZtKQ1f1jws3BWoXziP9NfZ7V81/jGVGQRaxesxE2o3BsPt8KexNS i7ZT9b7NlMCqPrucaXuqGCTZ4E2WJ3i8IjKudGoTAr2itRYBYDM0WgZcD0K0kjFVBFYmU ZisTVZwsdhe9c1y0J0hwF7KHaeJkf58nsdYXlAMK09kHkLJEweH6QmWxCqKgTOOkTC99K 2yIj0HZcZNrONMC6haaKPqS1PxOIUbcOaSDdMn4f76UanHnAJ5/6m0RyXcsOATK1sEA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793210860; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=2v51lUCaHo6JfdB5kqxTMiVDPUnfb6WUA5rcO9o6ckM=; b=VO9QNgjapAOv/ZSCnNwD8eRvN5u5UvK+uiNp86hI5L6GAjOY24ujfU6tgxDQaYvC72o4 fQ4tuDa+HRXTW0auzenlP4nnAc5DxuvDF2TPXUpXhHO/gVC/hnNX6RQj0u7/HrbeWbQLw ZcxNiYwNc8wFZ3TmHfjfTqeQed58WMN3UJylECjxuBqdhwq8+imIDZGM2VmBlfNdj63t5 3cuJ7bMzr+Zjx/3Dbljn4TP45/l7X1Ek3O05BVDbvST0IFQC+5ELHfmASQ5fgf6Ii3ZnJ JtdiqamR6+9YsAoj8IX44fI1dpU62hJTRjx2bvPPbKAJVl5Gr9dpgvH+TfFDNMFsijg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ewmkCLwk; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0C87D606A31E; Wed, 28 Oct 2026 18:07:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ewmkCLwk Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FC9D1F031E0; Wed, 28 Oct 2026 18:07:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793210859; bh=2v51lUCaHo6JfdB5kqxTMiVDPUnfb6WUA5rcO9o6ckM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ewmkCLwk/+4oY93VDRMFfh4atuop+BaIXrB6+Td+4Q4ohEH8JU6tY6ru1XgiAyNZ+ wPxFlryxgPx2KhAkMhT2bvUgYdVZFCNPj1ZqdewLqvWUPuI1o7io8pru3W8XGGNjSd wTsXo5vNBYtN60AQaj7NVDojUckZIZgV0iw2DdHo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sai Teja Aluvala , Luiz Augusto von Dentz , Sasha Levin Subject: [PATCH 5.15 172/571] Bluetooth: btintel: validate DDC record lengths Date: Wed, 28 Oct 2026 17:55:19 +0100 Message-ID: <20261028170012.095407450@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170008.009143722@linuxfoundation.org> References: <20261028170008.009143722@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sai Teja Aluvala [ Upstream commit c9c15d4d8956df8c564f7c210e4dc5b9b820d97a ] Parse DDC record lengths in unsigned storage so 0xFF does not wrap. Reject records smaller than the mandatory three-byte header, records exceeding U8_MAX, and records exceeding remaining firmware bytes before issuing Intel_Write_DDC. This issue was reported by Claude Mythos. Fixes: 145f2368c5fd ("Bluetooth: btintel: Add Device Configuration support") Signed-off-by: Sai Teja Aluvala Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- drivers/bluetooth/btintel.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index 0635df202dfad..8f85cc300d8b7 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -358,8 +358,16 @@ int btintel_load_ddc_config(struct hci_dev *hdev, const char *ddc_name) /* DDC file contains one or more DDC structure which has * Length (1 byte), DDC ID (2 bytes), and DDC value (Length - 2). */ - while (fw->size > fw_ptr - fw->data) { - u8 cmd_plen = fw_ptr[0] + sizeof(u8); + while (fw->size > (size_t)(fw_ptr - fw->data)) { + size_t remaining = fw->size - (fw_ptr - fw->data); + unsigned int cmd_plen = fw_ptr[0] + 1U; + + if (cmd_plen < 3 || cmd_plen > U8_MAX || cmd_plen > remaining) { + bt_dev_err(hdev, "Malformed DDC record (plen=%u, remaining=%zu)", + cmd_plen, remaining); + release_firmware(fw); + return -EINVAL; + } skb = __hci_cmd_sync(hdev, 0xfc8b, cmd_plen, fw_ptr, HCI_INIT_TIMEOUT); -- 2.53.0