diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-01-07 22:09:27 -0800 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-01-20 01:34:15 -0800 |
| commit | 21aaa23b0ebbd19334fa461370c03cbb076b3295 (patch) | |
| tree | ee480a095123426c81a9aac8fed0fba8fe27fc74 /drivers/target/iscsi | |
| parent | d36ad77f702356afb1009d2987b0ab55da4c7d57 (diff) | |
| download | linux-21aaa23b0ebbd19334fa461370c03cbb076b3295.tar.bz2 | |
target: Obtain se_node_acl->acl_kref during get_initiator_node_acl
This patch addresses a long standing race where obtaining
se_node_acl->acl_kref in __transport_register_session()
happens a bit too late, and leaves open the potential
for core_tpg_del_initiator_node_acl() to hit a NULL
pointer dereference.
Instead, take ->acl_kref in core_tpg_get_initiator_node_acl()
while se_portal_group->acl_node_mutex is held, and move the
final target_put_nacl() from transport_deregister_session()
into transport_free_session() so that fabric driver login
failure handling using the modern method to still work
as expected.
Also, update core_tpg_get_initiator_node_acl() to take
an extra reference for dynamically generated acls for
demo-mode, before returning to fabric caller. Also
update iscsi-target sendtargets special case handling
to use target_tpg_has_node_acl() when checking if
demo_mode_discovery == true during discovery lookup.
Note the existing wait_for_completion(&acl->acl_free_comp)
in core_tpg_del_initiator_node_acl() does not change.
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/iscsi')
| -rw-r--r-- | drivers/target/iscsi/iscsi_target.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index a81c0e5ca293..762b2d6ea1cc 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -3435,7 +3435,7 @@ iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, if ((tpg->tpg_attrib.generate_node_acls == 0) && (tpg->tpg_attrib.demo_mode_discovery == 0) && - (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg, + (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, cmd->conn->sess->sess_ops->InitiatorName))) { continue; } |