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Bluetooth: RFCOMM: Replace use of memcpy_from_msg with bt_skb_sendmmsg
This makes use of bt_skb_sendmmsg instead using memcpy_from_msg which is not considered safe to be used when lock_sock is held. Also make rfcomm_dlc_send handle skb with fragments and queue them all atomically. Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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@ -549,22 +549,58 @@ struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel)
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return dlc;
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}
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int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
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static int rfcomm_dlc_send_frag(struct rfcomm_dlc *d, struct sk_buff *frag)
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{
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int len = skb->len;
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if (d->state != BT_CONNECTED)
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return -ENOTCONN;
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int len = frag->len;
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BT_DBG("dlc %p mtu %d len %d", d, d->mtu, len);
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if (len > d->mtu)
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return -EINVAL;
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rfcomm_make_uih(skb, d->addr);
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skb_queue_tail(&d->tx_queue, skb);
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rfcomm_make_uih(frag, d->addr);
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__skb_queue_tail(&d->tx_queue, frag);
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if (!test_bit(RFCOMM_TX_THROTTLED, &d->flags))
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return len;
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}
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int rfcomm_dlc_send(struct rfcomm_dlc *d, struct sk_buff *skb)
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{
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unsigned long flags;
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struct sk_buff *frag, *next;
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int len;
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if (d->state != BT_CONNECTED)
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return -ENOTCONN;
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frag = skb_shinfo(skb)->frag_list;
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skb_shinfo(skb)->frag_list = NULL;
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/* Queue all fragments atomically. */
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spin_lock_irqsave(&d->tx_queue.lock, flags);
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len = rfcomm_dlc_send_frag(d, skb);
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if (len < 0 || !frag)
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goto unlock;
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for (; frag; frag = next) {
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int ret;
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next = frag->next;
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ret = rfcomm_dlc_send_frag(d, frag);
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if (ret < 0) {
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kfree_skb(frag);
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goto unlock;
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}
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len += ret;
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}
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unlock:
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spin_unlock_irqrestore(&d->tx_queue.lock, flags);
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if (len > 0 && !test_bit(RFCOMM_TX_THROTTLED, &d->flags))
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rfcomm_schedule();
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return len;
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}
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@ -575,47 +575,21 @@ static int rfcomm_sock_sendmsg(struct socket *sock, struct msghdr *msg,
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lock_sock(sk);
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sent = bt_sock_wait_ready(sk, msg->msg_flags);
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if (sent)
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goto done;
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while (len) {
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size_t size = min_t(size_t, len, d->mtu);
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int err;
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skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
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msg->msg_flags & MSG_DONTWAIT, &err);
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if (!skb) {
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if (sent == 0)
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sent = err;
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break;
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}
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skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
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err = memcpy_from_msg(skb_put(skb, size), msg, size);
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if (err) {
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kfree_skb(skb);
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if (sent == 0)
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sent = err;
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break;
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}
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skb->priority = sk->sk_priority;
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err = rfcomm_dlc_send(d, skb);
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if (err < 0) {
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kfree_skb(skb);
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if (sent == 0)
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sent = err;
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break;
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}
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sent += size;
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len -= size;
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}
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done:
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release_sock(sk);
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if (sent)
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return sent;
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skb = bt_skb_sendmmsg(sk, msg, len, d->mtu, RFCOMM_SKB_HEAD_RESERVE,
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RFCOMM_SKB_TAIL_RESERVE);
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if (IS_ERR_OR_NULL(skb))
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return PTR_ERR(skb);
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sent = rfcomm_dlc_send(d, skb);
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if (sent < 0)
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kfree_skb(skb);
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return sent;
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}
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