This fixes a regression from commit
2ead70b8390d199ca04cd35311b51f5f3676079e that is present in all
kernels starting at v3.0.
When L2CAP information was moved to struct l2cap_chan, a check was
added to l2cap_chan_del to avoid certain cleanup operations when ERTM
or streaming mode had not yet been initialized. The logic in the
check did not take in to account that chan->conf_state is set to 0 in
l2cap_chan_ready, so l2cap_chan_del failed to cancel timers and leaked
memory any time the ERTM queues or lists were not empty.
This change makes sure that l2cap_chan_del only returns early if
ERTM initialization was not performed.
Signed-off-by: Mat Martineau <mathewm@xxxxxxxxxxxxxx>
---
include/net/bluetooth/l2cap.h | 1 +
net/bluetooth/l2cap_core.c | 7 +++++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 1c7d1cd..452fcc4 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -597,6 +597,7 @@ enum {
CONF_EWS_RECV,
CONF_LOC_CONF_PEND,
CONF_REM_CONF_PEND,
+ CONF_NOT_COMPLETE,
};
#define L2CAP_CONF_MAX_CONF_REQ 2
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 078bf80..d9f215f 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -392,6 +392,9 @@ struct l2cap_chan *l2cap_chan_create(void)
atomic_set(&chan->refcnt, 1);
+ /* This flag is cleared in l2cap_chan_ready() */
+ set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
+
BT_DBG("chan %p", chan);
return chan;
@@ -509,8 +512,7 @@ static void l2cap_chan_del(struct l2cap_chan *chan, int err)
release_sock(sk);
- if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
- test_bit(CONF_INPUT_DONE, &chan->conf_state)))
+ if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
return;
skb_queue_purge(&chan->tx_q);
@@ -923,6 +925,7 @@ static void l2cap_chan_ready(struct l2cap_chan *chan)
BT_DBG("sk %p, parent %p", sk, parent);
+ /* This clears all conf flags, including CONF_NOT_COMPLETE */
chan->conf_state = 0;
__clear_chan_timer(chan);
--
1.7.10
--
Mat Martineau
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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