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authorDean Jenkins <Dean_Jenkins@mentor.com>2015-06-23 16:59:39 (GMT)
committerMarcel Holtmann <marcel@holtmann.org>2015-07-23 15:10:51 (GMT)
commite432c72c464d2deb6c66d1e2a5f548dc1f0ef4dc (patch)
tree1206dfbdbb74bf9b5ffa8bf9999b824761cea681 /net/bluetooth
parentcb02a25583b59ce48267472cd092485d754964f9 (diff)
Bluetooth: __l2cap_wait_ack() add defensive timeout
Add a timeout to prevent the do while loop running in an infinite loop. This ensures that the channel will be instructed to close within 10 seconds so prevents l2cap_sock_shutdown() getting stuck forever. Returns -ENOLINK when the timeout is reached. The channel will be subequently closed and not all data will be ACK'ed. Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap_sock.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index f0b052a..586b3d5 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1059,11 +1059,15 @@ static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
DECLARE_WAITQUEUE(wait, current);
int err = 0;
int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
+ /* Timeout to prevent infinite loop */
+ unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
add_wait_queue(sk_sleep(sk), &wait);
set_current_state(TASK_INTERRUPTIBLE);
do {
- BT_DBG("Waiting for %d ACKs", chan->unacked_frames);
+ BT_DBG("Waiting for %d ACKs, timeout %04d ms",
+ chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
+ jiffies_to_msecs(timeout - jiffies));
if (!timeo)
timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
@@ -1082,6 +1086,11 @@ static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
if (err)
break;
+ if (time_after(jiffies, timeout)) {
+ err = -ENOLINK;
+ break;
+ }
+
} while (chan->unacked_frames > 0 &&
chan->state == BT_CONNECTED);

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