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tcm_qla2xxx: Don't insert nacls without sessions into the btree 

When we create an explicit node ACL in tcm_qla2xxx_make_nodeacl(),
there is a call to tcm_qla2xxx_setup_nacl_from_rport(), which puts the
node ACL into the lport_fcport_map even though there is no session yet
for the initiator.  Since the only time we remove entries from this
map is when we free a session, this means that if we later delete this
node ACL without the initiator ever creating a session, we'll leave
the nacl pointer in the btree pointing at freed memory.

This is especially bad if that initiator later does send us a command
that would cause us to create a dynamic ACL and session: we'll find
the stale freed nacl pointer in the btree and end up with use-after-free.

We could add more code to clear the btree entry when deleting the
explicit nacl, but the original insertion is pointless: without a
session attached, we'll just have to update the entry when a session
appears anyway.  So we can just delete tcm_qla2xxx_setup_nacl_from_rport()
and the code that calls it.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: Chad Dupuis <chad.dupuis@qlogic.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Cc: Arun Easi <arun.easi@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2012-06-04 23:37:34 -07:00 committed by Nicholas Bellinger
parent 59e4f541ba
commit 3578ddba1a
1 changed files with 0 additions and 73 deletions
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73
drivers/scsi/qla2xxx/tcm_qla2xxx.c
View File

@ -762,65 +762,6 @@ static u16 tcm_qla2xxx_set_fabric_sense_len(struct se_cmd *se_cmd,
struct target_fabric_configfs *tcm_qla2xxx_fabric_configfs;
struct target_fabric_configfs *tcm_qla2xxx_npiv_fabric_configfs;
static int tcm_qla2xxx_setup_nacl_from_rport(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct tcm_qla2xxx_lport *lport,
struct tcm_qla2xxx_nacl *nacl,
u64 rport_wwnn)
{
struct scsi_qla_host *vha = lport->qla_vha;
struct Scsi_Host *sh = vha->host;
struct fc_host_attrs *fc_host = shost_to_fc_host(sh);
struct fc_rport *rport;
unsigned long flags;
void *node;
int rc;
/*
* Scan the existing rports, and create a session for the
* explict NodeACL is an matching rport->node_name already
* exists.
*/
spin_lock_irqsave(sh->host_lock, flags);
list_for_each_entry(rport, &fc_host->rports, peers) {
if (rport_wwnn != rport->node_name)
continue;
pr_debug("Located existing rport_wwpn and rport->node_name: 0x%016LX, port_id: 0x%04x\n",
rport->node_name, rport->port_id);
nacl->nport_id = rport->port_id;
spin_unlock_irqrestore(sh->host_lock, flags);
spin_lock_irqsave(&vha->hw->hardware_lock, flags);
node = btree_lookup32(&lport->lport_fcport_map, rport->port_id);
if (node) {
rc = btree_update32(&lport->lport_fcport_map,
rport->port_id, se_nacl);
} else {
rc = btree_insert32(&lport->lport_fcport_map,
rport->port_id, se_nacl,
GFP_ATOMIC);
}
spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
if (rc) {
pr_err("Unable to insert se_nacl into fcport_map");
WARN_ON(rc > 0);
return rc;
}
pr_debug("Inserted into fcport_map: %p for WWNN: 0x%016LX, port_id: 0x%08x\n",
se_nacl, rport_wwnn, nacl->nport_id);
return 1;
}
spin_unlock_irqrestore(sh->host_lock, flags);
return 0;
}
static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *,
struct tcm_qla2xxx_nacl *, struct qla_tgt_sess *);
/*
@ -890,14 +831,10 @@ static struct se_node_acl *tcm_qla2xxx_make_nodeacl(
struct config_group *group,
const char *name)
{
struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
struct tcm_qla2xxx_lport, lport_wwn);
struct se_node_acl *se_nacl, *se_nacl_new;
struct tcm_qla2xxx_nacl *nacl;
u64 wwnn;
u32 qla2xxx_nexus_depth;
int rc;
if (tcm_qla2xxx_parse_wwn(name, &wwnn, 1) < 0)
return ERR_PTR(-EINVAL);
@ -924,16 +861,6 @@ static struct se_node_acl *tcm_qla2xxx_make_nodeacl(
nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
nacl->nport_wwnn = wwnn;
tcm_qla2xxx_format_wwn(&nacl->nport_name[0], TCM_QLA2XXX_NAMELEN, wwnn);
/*
* Setup a se_nacl handle based on an a matching struct fc_rport setup
* via drivers/scsi/qla2xxx/qla_init.c:qla2x00_reg_remote_port()
*/
rc = tcm_qla2xxx_setup_nacl_from_rport(se_tpg, se_nacl, lport,
nacl, wwnn);
if (rc < 0) {
tcm_qla2xxx_release_fabric_acl(se_tpg, se_nacl_new);
return ERR_PTR(rc);
}
return se_nacl;
}