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authorGustavo F. Padovan <padovan@profusion.mobi>2010-05-05 04:16:01 +0200
committerMarcel Holtmann <marcel@holtmann.org>2010-05-10 09:28:53 +0200
commit844c0972427ee5f661158160aaca10b22b3dda60 (patch)
treeb4e7694efc8dbfbc88ecfcca97a2381f0144c046 /net/bluetooth/l2cap.c
parentBluetooth: Prevents buffer overflow on l2cap_ertm_reassembly_sdu() (diff)
downloadlinux-844c0972427ee5f661158160aaca10b22b3dda60.tar.xz
linux-844c0972427ee5f661158160aaca10b22b3dda60.zip
Bluetooth: Fix spec error in the RemoteBusy Logic
On the receipt of an RR(P=1) under RemoteBusy set to TRUE(on the RECV state table) we have to call sendIorRRorRNR(F=1) and just after set RemoteBusy to False. This leads to a freeze in the sending process since it's not allowed send data with RemoteBusy set to true and no one call SendPending-I-Frames after set RemoteBusy to false(The last action for that event). Actually sendIorRRorRNR() calls SendPending-I-Frames but at that moment RemoteBusy is still True and we cannot send any frame, after, no one calls SendPending-I-Frames again and the sending process stops. The solution here is to set RemoteBusy to false inside SendPending-I-Frames just before call SendPending-I-Frames. That will make SendPending-I-Frames able to send frames. This solution is similar to what RR(P=0)(F=0) on the RECV table and RR(P=1) on the SREJ_SENT table do. Actually doesn't make any sense call SendPending-I-Frames if we can send any frame, i. e., RemoteBusy is True. Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/l2cap.c')
-rw-r--r--net/bluetooth/l2cap.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 9ef01c32b3a2..ba49f9a3579e 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -3379,6 +3379,8 @@ static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0)
__mod_retrans_timer();
+ pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
+
spin_lock_bh(&pi->send_lock);
l2cap_ertm_send(sk);
spin_unlock_bh(&pi->send_lock);
@@ -3936,7 +3938,6 @@ static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
l2cap_send_srejtail(sk);
} else {
l2cap_send_i_or_rr_or_rnr(sk);
- pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
}
} else if (rx_control & L2CAP_CTRL_FINAL) {