From: Karsten Graul <kgraul@xxxxxxxxxxxxx>
[ Upstream commit 77f838ace755d2f466536c44dac6c856f62cd901 ]
To prevent races between smc_lgr_terminate() and smc_conn_free() add an
extra check of the lgr field before accessing it, and cancel a delayed
free_work when a new smc connection is created.
This fixes the problem that free_work cleared the lgr variable but
smc_lgr_terminate() or smc_conn_free() still access it in parallel.
Signed-off-by: Karsten Graul <kgraul@xxxxxxxxxxxxx>
Signed-off-by: Ursula Braun <ubraun@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/smc/smc_core.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index f04a037dc9677..0de788fa43e95 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -103,6 +103,8 @@ static void smc_lgr_unregister_conn(struct smc_connection *conn)
struct smc_link_group *lgr = conn->lgr;
int reduced = 0;
+ if (!lgr)
+ return;
write_lock_bh(&lgr->conns_lock);
if (conn->alert_token_local) {
reduced = 1;
@@ -431,6 +433,8 @@ int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr,
local_contact = SMC_REUSE_CONTACT;
conn->lgr = lgr;
smc_lgr_register_conn(conn); /* add smc conn to lgr */
+ if (delayed_work_pending(&lgr->free_work))
+ cancel_delayed_work(&lgr->free_work);
write_unlock_bh(&lgr->conns_lock);
break;
}
--
2.20.1
