Syzbot report the following issue:
infiniband syj1: RDMA CMA: cma_listen_on_dev, error -98
unregister_netdevice: waiting for vlan0 to become free. Usage count = 2
The causes are as follows:
rdma_listen()
rdma_bind_addr()
cma_acquire_dev_by_src_ip()
cma_attach_to_dev()
_cma_attach_to_dev()
cma_dev_get()
cma_check_port()
<--The return value is -98， goto err
err:
<-- The error handling here is missing the operation of cma_release_dev.
To fix, add cma_release_dev to error handing.
Fixes: e51060f08a61 ("IB: IP address based RDMA connection manager")
Reported-by: syzbot+5e70d01ee8985ae62a3b@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Wang Yufen <wangyufen@xxxxxxxxxx>
---
drivers/infiniband/core/cma.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 26d1772..3a50a8e 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -4049,6 +4049,9 @@ int rdma_listen(struct rdma_cm_id *id, int backlog)
return 0;
err:
id_priv->backlog = 0;
+ if (id_priv->cma_dev)
+ cma_release_dev(id_priv);
+
/*
* All the failure paths that lead here will not allow the req_handler's
* to have run.
--
1.8.3.1
