Bluetooth: Fix using a NULL inquiry cache entry

If the device was not found in a list of found devices names of which
are pending.This may happen in a case when HCI Remote Name Request
was sent as a part of incoming connection establishment procedure.
Hence there is no need to continue resolving a next name as it will
be done upon receiving another Remote Name Request Complete Event.
This will fix a kernel crash when trying to use this entry to resolve
the next name.

Cc: stable@vger.kernel.org
Signed-off-by: Ram Malovany <ramm@ti.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

1 files changed, 11 insertions, 5 deletions

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index b64cfa213bd6..fe9a3d6d30b0 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1396,12 +1396,18 @@ static void hci_check_pending_name(struct hci_dev *hdev, struct hci_conn *conn,
                 return;
 
         e = hci_inquiry_cache_lookup_resolve(hdev, bdaddr, NAME_PENDING);
-        if (e) {
+        /* If the device was not found in a list of found devices names of which
+         * are pending. there is no need to continue resolving a next name as it
+         * will be done upon receiving another Remote Name Request Complete
+         * Event */
+        if (!e)
+                return;
+
+        list_del(&e->list);
+        if (name) {
                 e->name_state = NAME_KNOWN;
-                list_del(&e->list);
-                if (name)
-                        mgmt_remote_name(hdev, bdaddr, ACL_LINK, 0x00,
-                                         e->data.rssi, name, name_len);
+                mgmt_remote_name(hdev, bdaddr, ACL_LINK, 0x00,
+                                 e->data.rssi, name, name_len);
         }
 
         if (hci_resolve_next_name(hdev))