Bluetooth: Restrict HIDP flags to only valid ones

The HIDP flags should be clearly restricted to valid ones. So this puts
extra checks in place to ensure this.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 07348e142f16..926a0e8b7136 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -70,10 +70,11 @@ static void hidp_session_terminate(struct hidp_session *s);
 
 static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
 {
+        u32 valid_flags = 0;
         memset(ci, 0, sizeof(*ci));
         bacpy(&ci->bdaddr, &session->bdaddr);
 
-        ci->flags = session->flags;
+        ci->flags = session->flags & valid_flags;
         ci->state = BT_CONNECTED;
 
         if (session->input) {
@@ -1312,6 +1313,7 @@ int hidp_connection_add(struct hidp_connadd_req *req,
                         struct socket *ctrl_sock,
                         struct socket *intr_sock)
 {
+        u32 valid_flags = 0;
         struct hidp_session *session;
         struct l2cap_conn *conn;
         struct l2cap_chan *chan;
@@ -1321,6 +1323,9 @@ int hidp_connection_add(struct hidp_connadd_req *req,
         if (ret)
                 return ret;
 
+        if (req->flags & ~valid_flags)
+                return -EINVAL;
+
         chan = l2cap_pi(ctrl_sock->sk)->chan;
         conn = NULL;
         l2cap_chan_lock(chan);
@@ -1351,8 +1356,12 @@ out_conn:
 
 int hidp_connection_del(struct hidp_conndel_req *req)
 {
+        u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
         struct hidp_session *session;
 
+        if (req->flags & ~valid_flags)
+                return -EINVAL;
+
         session = hidp_session_find(&req->bdaddr);
         if (!session)
                 return -ENOENT;