3 files changed, 51 insertions, 33 deletions

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index 27a902d9b3a9..30fce0128dd7 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -161,12 +161,30 @@ static inline struct sk_buff *bt_skb_send_alloc(struct sock *sk, unsigned long l
 {
         struct sk_buff *skb;
 
+        release_sock(sk);
         if ((skb = sock_alloc_send_skb(sk, len + BT_SKB_RESERVE, nb, err))) {
                 skb_reserve(skb, BT_SKB_RESERVE);
                 bt_cb(skb)->incoming  = 0;
         }
+        lock_sock(sk);
+
+        if (!skb && *err)
+                return NULL;
+
+        *err = sock_error(sk);
+        if (*err)
+                goto out;
+
+        if (sk->sk_shutdown) {
+                *err = -ECONNRESET;
+                goto out;
+        }
 
         return skb;
+
+out:
+        kfree_skb(skb);
+        return NULL;
 }
 
 int bt_err(__u16 code);
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index fadf26b4ed7c..0b54b7dd8401 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1441,33 +1441,23 @@ static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
 
 static void l2cap_streaming_send(struct sock *sk)
 {
-        struct sk_buff *skb, *tx_skb;
+        struct sk_buff *skb;
         struct l2cap_pinfo *pi = l2cap_pi(sk);
         u16 control, fcs;
 
-        while ((skb = sk->sk_send_head)) {
-                tx_skb = skb_clone(skb, GFP_ATOMIC);
-
-                control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
+        while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
+                control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
                 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
-                put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
+                put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
 
                 if (pi->fcs == L2CAP_FCS_CRC16) {
-                        fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
-                        put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
+                        fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
+                        put_unaligned_le16(fcs, skb->data + skb->len - 2);
                 }
 
-                l2cap_do_send(sk, tx_skb);
+                l2cap_do_send(sk, skb);
 
                 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
-
-                if (skb_queue_is_last(TX_QUEUE(sk), skb))
-                        sk->sk_send_head = NULL;
-                else
-                        sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
-
-                skb = skb_dequeue(TX_QUEUE(sk));
-                kfree_skb(skb);
         }
 }
 
@@ -1960,6 +1950,11 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __us
 
         switch (optname) {
         case L2CAP_OPTIONS:
+                if (sk->sk_state == BT_CONNECTED) {
+                        err = -EINVAL;
+                        break;
+                }
+
                 opts.imtu     = l2cap_pi(sk)->imtu;
                 opts.omtu     = l2cap_pi(sk)->omtu;
                 opts.flush_to = l2cap_pi(sk)->flush_to;
@@ -2771,10 +2766,10 @@ static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data,
                 case L2CAP_CONF_MTU:
                         if (val < L2CAP_DEFAULT_MIN_MTU) {
                                 *result = L2CAP_CONF_UNACCEPT;
-                                pi->omtu = L2CAP_DEFAULT_MIN_MTU;
+                                pi->imtu = L2CAP_DEFAULT_MIN_MTU;
                         } else
-                                pi->omtu = val;
-                        l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
+                                pi->imtu = val;
+                        l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
                         break;
 
                 case L2CAP_CONF_FLUSH_TO:
@@ -3071,6 +3066,17 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
         return 0;
 }
 
+static inline void set_default_fcs(struct l2cap_pinfo *pi)
+{
+        /* FCS is enabled only in ERTM or streaming mode, if one or both
+         * sides request it.
+         */
+        if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING)
+                pi->fcs = L2CAP_FCS_NONE;
+        else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV))
+                pi->fcs = L2CAP_FCS_CRC16;
+}
+
 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
 {
         struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
@@ -3088,14 +3094,8 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
         if (!sk)
                 return -ENOENT;
 
-        if (sk->sk_state != BT_CONFIG) {
-                struct l2cap_cmd_rej rej;
-
-                rej.reason = cpu_to_le16(0x0002);
-                l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
-                                sizeof(rej), &rej);
+        if (sk->sk_state == BT_DISCONN)
                 goto unlock;
-        }
 
         /* Reject if config buffer is too small. */
         len = cmd_len - sizeof(*req);
@@ -3135,9 +3135,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
                 goto unlock;
 
         if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
-                if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
-                    l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
-                        l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
+                set_default_fcs(l2cap_pi(sk));
 
                 sk->sk_state = BT_CONNECTED;
 
@@ -3225,9 +3223,7 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
         l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
 
         if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
-                if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
-                    l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
-                        l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
+                set_default_fcs(l2cap_pi(sk));
 
                 sk->sk_state = BT_CONNECTED;
                 l2cap_pi(sk)->next_tx_seq = 0;
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 44a623275951..194b3a04cfd3 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -82,11 +82,14 @@ static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
 static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
 {
         struct sock *sk = d->owner, *parent;
+        unsigned long flags;
+
         if (!sk)
                 return;
 
         BT_DBG("dlc %p state %ld err %d", d, d->state, err);
 
+        local_irq_save(flags);
         bh_lock_sock(sk);
 
         if (err)
@@ -108,6 +111,7 @@ static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
         }
 
         bh_unlock_sock(sk);
+        local_irq_restore(flags);
 
         if (parent && sock_flag(sk, SOCK_ZAPPED)) {
                 /* We have to drop DLC lock here, otherwise