From: Lv Ruyi <lv.ruyi@xxxxxxxxxx>
rcu_dereference may return NULL, so check the returned pointer.
Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
Signed-off-by: Lv Ruyi <lv.ruyi@xxxxxxxxxx>
---
drivers/block/drbd/drbd_req.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index e1e58e91ee58..8ab6da155e2f 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -577,6 +577,10 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
D_ASSERT(device, !(req->rq_state & RQ_NET_MASK));
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
+ if (!nc) {
+ rcu_read_unlock();
+ break;
+ }
p = nc->wire_protocol;
rcu_read_unlock();
req->rq_state |=
@@ -690,6 +694,10 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
/* close the epoch, in case it outgrew the limit */
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
+ if (!nc) {
+ rcu_read_unlock();
+ break;
+ }
p = nc->max_epoch_size;
rcu_read_unlock();
if (connection->current_tle_writes >= p)
--
2.25.1
