ccid2_hc_tx_rto_expire() timer callback always restarts the timer
again and can run indefinitely (unless it is stopped outside), and
after commit 120e9dabaf55 ("dccp: defer ccid_hc_tx_delete() at
dismantle time"), which moved sk_stop_timer() to sk_destruct(),
this started to happen quite often. The timer prevents releasing
the socket, as a result, sk_destruct() won't be called.
Found with LTP/dccp_ipsec tests running on the bonding device,
which later couldn't be unloaded after the tests were completed:
unregister_netdevice: waiting for bond0 to become free. Usage count = 148
Fixes: 120e9dabaf55 ("dccp: defer ccid_hc_tx_delete() at dismantle time")
Signed-off-by: Alexey Kodanev <[email protected]>
---
net/dccp/ccids/ccid2.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 1c75cd1..92d016e 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -140,6 +140,9 @@ static void ccid2_hc_tx_rto_expire(struct timer_list *t)
ccid2_pr_debug("RTO_EXPIRE\n");
+ if (sk->sk_state == DCCP_CLOSED)
+ goto out;
+
/* back-off timer */
hc->tx_rto <<= 1;
if (hc->tx_rto > DCCP_RTO_MAX)
--
1.7.1
