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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>
This commit is contained in:
Dotan Barak 2019-10-01 10:21:02 -07:00 committed by David S. Miller
parent e8521e53cc
commit d64bf89a75
1 changed files with 3 additions and 3 deletions
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6
net/rds/ib.c
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@ -143,6 +143,9 @@ static void rds_ib_add_one(struct ib_device *device)
refcount_set(&rds_ibdev->refcount, 1); refcount_set(&rds_ibdev->refcount, 1);
INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free); 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_wrs = device->attrs.max_qp_wr;
rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE); 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, device->name,
rds_ibdev->use_fastreg ? "FRMR" : "FMR"); 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); down_write(&rds_ib_devices_lock);
list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices); list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
up_write(&rds_ib_devices_lock); up_write(&rds_ib_devices_lock);