From 6131ddc8eb9bad8c4ff37e097b2537c819b76cc0 Mon Sep 17 00:00:00 2001 From: Johan Hedberg Date: Tue, 18 Feb 2014 10:19:37 +0200 Subject: [PATCH] Bluetooth: Fix properly ignoring unexpected SMP PDUs If we didn't request certain pieces of information during the key distribution negotiation we should properly ignore those PDUs if the peer incorrectly sends them. This includes the Encryption Information and Master Identification PDUs if the EncKey bit was not set, and the Identity Information and Identity Address Information PDUs if the IdKey bit was not set. Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann --- net/bluetooth/smp.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 024baa7..5867c1c 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -891,6 +891,10 @@ static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) if (skb->len < sizeof(*rp)) return SMP_UNSPECIFIED; + /* Ignore this PDU if it wasn't requested */ + if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) + return 0; + skb_pull(skb, sizeof(*rp)); memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); @@ -911,6 +915,10 @@ static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) if (skb->len < sizeof(*rp)) return SMP_UNSPECIFIED; + /* Ignore this PDU if it wasn't requested */ + if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) + return 0; + skb_pull(skb, sizeof(*rp)); hci_dev_lock(hdev); @@ -935,6 +943,10 @@ static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) if (skb->len < sizeof(*info)) return SMP_UNSPECIFIED; + /* Ignore this PDU if it wasn't requested */ + if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) + return 0; + skb_pull(skb, sizeof(*info)); memcpy(smp->irk, info->irk, 16); @@ -955,6 +967,10 @@ static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, if (skb->len < sizeof(*info)) return SMP_UNSPECIFIED; + /* Ignore this PDU if it wasn't requested */ + if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) + return 0; + skb_pull(skb, sizeof(*info)); bacpy(&smp->id_addr, &info->bdaddr); -- 2.7.4