Return-Path: From: Mat Martineau To: linux-bluetooth@vger.kernel.org, gustavo@padovan.org, marcel@holtmann.org Cc: pkrystad@codeaurora.org Subject: [PATCHv2] Bluetooth: Fix early return from l2cap_chan_del Date: Thu, 17 May 2012 21:14:09 -0700 Message-Id: <1337314449-27842-1-git-send-email-mathewm@codeaurora.org> List-ID: 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 --- 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