net/rds: Fix error handling in rds_ib_add_one()

rds_ibdev:ipaddr_list and rds_ibdev:conn_list are initialized
after allocation some resources such as protection domain.
If allocation of such resources fail, then these uninitialized
variables are accessed in rds_ib_dev_free() in failure path. This
can potentially crash the system. The code has been updated to
initialize these variables very early in the function.

Signed-off-by: Dotan Barak <dotanb@dev.mellanox.co.il>
Signed-off-by: Sudhakar Dindukurti <sudhakar.dindukurti@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/rds/ib.c b/net/rds/ib.c
index 45acab2de0cf3e09b295d2faf7db3b3c78528fc5..9de2ae22d583136c0346dcfbb9951344d6645cc4 100644 (file)
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -143,6 +143,9 @@ static void rds_ib_add_one(struct ib_device *device)
        refcount_set(&rds_ibdev->refcount, 1);
        INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
 
+       INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
+       INIT_LIST_HEAD(&rds_ibdev->conn_list);
+
        rds_ibdev->max_wrs = device->attrs.max_qp_wr;
        rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
 
@@ -203,9 +206,6 @@ static void rds_ib_add_one(struct ib_device *device)
                device->name,
                rds_ibdev->use_fastreg ? "FRMR" : "FMR");
 
-       INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
-       INIT_LIST_HEAD(&rds_ibdev->conn_list);
-
        down_write(&rds_ib_devices_lock);
        list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
        up_write(&rds_ib_devices_lock);