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From:   Kiran K <kiran.k@intel.com>
To:     linux-bluetooth@vger.kernel.org
Cc:     ravishankar.srivatsa@intel.com, chethan.tumkur.narayan@intel.com,
        tedd.an@intel.com, luiz.von.dentz@intel.com,
        Kiran K <kiran.k@intel.com>
Subject: [PATCH v2] Bluetooth: btintel: Fix bdaddress comparison with garbage value
Date:   Wed, 13 Oct 2021 13:35:11 +0530
Message-Id: <20211013080511.23945-1-kiran.k@intel.com>
Precedence: bulk

Intel Read Verision(TLV) data is parsed into a local structure variable
and it contains a field for bd address. Bd address is returned only in
bootloader mode and hence bd address in TLV structure needs to be validated
only if controller is present in boot loader mode.

Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Tedd Ho-Jeong An <tedd.an@intel.com>
---

Notes:
    changes in v2:
    - Add comment for memsetting ver_tlv

 drivers/bluetooth/btintel.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index 9359bff47296..8f9109b40961 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -2081,14 +2081,16 @@ static int btintel_prepare_fw_download_tlv(struct hci_dev *hdev,
 	if (ver->img_type == 0x03) {
 		btintel_clear_flag(hdev, INTEL_BOOTLOADER);
 		btintel_check_bdaddr(hdev);
-	}
-
-	/* If the OTP has no valid Bluetooth device address, then there will
-	 * also be no valid address for the operational firmware.
-	 */
-	if (!bacmp(&ver->otp_bd_addr, BDADDR_ANY)) {
-		bt_dev_info(hdev, "No device address configured");
-		set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
+	} else {
+		/*
+		 * Check for valid bd address in boot loader mode. Device
+		 * will be marked as unconfigured if empty bd address is
+		 * found.
+		 */
+		if (!bacmp(&ver->otp_bd_addr, BDADDR_ANY)) {
+			bt_dev_info(hdev, "No device address configured");
+			set_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);
+		}
 	}
 
 	btintel_get_fw_name_tlv(ver, fwname, sizeof(fwname), "sfi");
@@ -2466,6 +2468,10 @@ static int btintel_setup_combined(struct hci_dev *hdev)
 		goto exit_error;
 	}
 
+	/* memset ver_tlv to start with clean state as few fields are exclusive
+	 * to bootloader mode and are not populated in operational mode
+	 */
+	memset(&ver_tlv, 0, sizeof(ver_tlv));
 	/* For TLV type device, parse the tlv data */
 	err = btintel_parse_version_tlv(hdev, &ver_tlv, skb);
 	if (err) {
-- 
2.17.1