Bluetooth: btrtl: check for NULL in btrtl_setup_realtek()

JIRA: https://issues.redhat.com/browse/RHEL-81268
CVE: CVE-2024-57987

commit 3c15082
Author: Max Chou <max.chou@realtek.com>
Date:   Tue Dec 31 14:57:19 2024 +0800

    Bluetooth: btrtl: check for NULL in btrtl_setup_realtek()

    If insert an USB dongle which chip is not maintained in ic_id_table, it
    will hit the NULL point accessed. Add a null point check to avoid the
    Kernel Oops.

    Fixes: b39910b ("Bluetooth: Populate hci_set_hw_info for Intel and Realtek")
    Reviewed-by: Alex Lu <alex_lu@realsil.com.cn>
    Signed-off-by: Max Chou <max.chou@realtek.com>
    Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

Author: CKI Backport Bot

drivers/bluetooth/btrtl.c

@@ -1351,12 +1351,14 @@ int btrtl_setup_realtek(struct hci_dev *hdev)
 
 	btrtl_set_quirks(hdev, btrtl_dev);
 
-	hci_set_hw_info(hdev,
+	if (btrtl_dev->ic_info) {
+		hci_set_hw_info(hdev,
 			"RTL lmp_subver=%u hci_rev=%u hci_ver=%u hci_bus=%u",
 			btrtl_dev->ic_info->lmp_subver,
 			btrtl_dev->ic_info->hci_rev,
 			btrtl_dev->ic_info->hci_ver,
 			btrtl_dev->ic_info->hci_bus);
+	}
 
 	btrtl_free(btrtl_dev);
 	return ret;