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Bluetooth: SCO - Fix missing msg_namelen update in sco_sock_recvmsg()

If the socket is in state BT_CONNECT2 and BT_SK_DEFER_SETUP is set in
the flags, sco_sock_recvmsg() returns early with 0 without updating the
possibly set msg_namelen member. This, in turn, leads to a 128 byte
kernel stack leak in net/socket.c.

Fix this by updating msg_namelen in this case. For all other cases it
will be handled in bt_sock_recvmsg().

Cc: Marcel Holtmann <>
Cc: Gustavo Padovan <>
Cc: Johan Hedberg <>
Signed-off-by: Mathias Krause <>
Signed-off-by: David S. Miller <>
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commit c8c499175f7d295ef867335bceb9a76a2c3cdc38 1 parent e11e045
@minipli minipli authored davem330 committed
Showing with 1 addition and 0 deletions.
  1. +1 −0  net/bluetooth/sco.c
1  net/bluetooth/sco.c
@@ -665,6 +665,7 @@ static int sco_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
hci_conn_accept(pi->conn->hcon, 0);
sk->sk_state = BT_CONFIG;
+ msg->msg_namelen = 0;
return 0;
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