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authorAlexey Kodanev <alexey.kodanev@oracle.com>2018-01-26 15:14:16 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-31 12:06:12 +0100
commite91e5b700fb6f887d4df4a18de0d8865df43d77d (patch)
tree40cfab148537f22854fc0d2045f21b9bdf7f5f94 /net/dccp
parent360496cab53af2f1dd77dbe353b7b665bcfdc1e3 (diff)
dccp: don't restart ccid2_hc_tx_rto_expire() if sk in closed state
[ Upstream commit dd5684ecae3bd8e44b644f50e2c12c7e57fdfef5 ] 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 ccid_hc_tx_delete() (also includes sk_stop_timer()) from dccp_destroy_sock() 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: 2a91aa396739 ("[DCCP] CCID2: Initial CCID2 (TCP-Like) implementation") Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/dccp')
-rw-r--r--net/dccp/ccids/ccid2.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 5e3a7302f774..7753681195c1 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -140,6 +140,9 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
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)