From: Dotan Barak <dotanb@dev.mellanox.co.il>
Date: Tue, 1 Oct 2019 10:21:02 -0700
Subject: net/rds: Fix error handling in rds_ib_add_one()
Git-commit: d64bf89a75b65f83f06be9fb8f978e60d53752db
Patch-mainline: 5.4-rc2
References: networking-stable-19_10_05

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/rds/ib.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -140,6 +140,9 @@ static void rds_ib_add_one(struct ib_dev
 	atomic_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);
 
@@ -199,9 +202,6 @@ static void rds_ib_add_one(struct ib_dev
 		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);