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target: Add link_magic for fabric allow_link destination target_items 

This patch adds [dev,lun]_link_magic value assignment + checks within generic
target_fabric_port_link() and target_fabric_mappedlun_link() code to ensure
destination config_item *target_item sent from configfs_symlink() ->
config_item_operations->allow_link() is the underlying se_device->dev_group
and se_lun->lun_group that we expect to symlink.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2012-12-04 23:43:57 -08:00
parent 3e4f574857
commit 0ff8754981
4 changed files with 18 additions and 0 deletions
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1
drivers/target/target_core_device.c
View File

@ -1352,6 +1352,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
if (!dev)
return NULL;
dev->dev_link_magic = SE_DEV_LINK_MAGIC;
dev->se_hba = hba;
dev->transport = hba->transport;

12
drivers/target/target_core_fabric_configfs.c
View File

@ -70,6 +70,12 @@ static int target_fabric_mappedlun_link(
struct se_portal_group *se_tpg;
struct config_item *nacl_ci, *tpg_ci, *tpg_ci_s, *wwn_ci, *wwn_ci_s;
int ret = 0, lun_access;
if (lun->lun_link_magic != SE_LUN_LINK_MAGIC) {
pr_err("Bad lun->lun_link_magic, not a valid lun_ci pointer:"
" %p to struct lun: %p\n", lun_ci, lun);
return -EFAULT;
}
/*
* Ensure that the source port exists
*/
@ -742,6 +748,12 @@ static int target_fabric_port_link(
struct target_fabric_configfs *tf;
int ret;
if (dev->dev_link_magic != SE_DEV_LINK_MAGIC) {
pr_err("Bad dev->dev_link_magic, not a valid se_dev_ci pointer:"
" %p to struct se_device: %p\n", se_dev_ci, dev);
return -EFAULT;
}
tpg_ci = &lun_ci->ci_parent->ci_group->cg_item;
se_tpg = container_of(to_config_group(tpg_ci),
struct se_portal_group, tpg_group);

1
drivers/target/target_core_tpg.c
View File

@ -669,6 +669,7 @@ int core_tpg_register(
for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
lun = se_tpg->tpg_lun_list[i];
lun->unpacked_lun = i;
lun->lun_link_magic = SE_LUN_LINK_MAGIC;
lun->lun_status = TRANSPORT_LUN_STATUS_FREE;
atomic_set(&lun->lun_acl_count, 0);
init_completion(&lun->lun_shutdown_comp);

4
include/target/target_core_base.h
View File

@ -624,6 +624,8 @@ struct se_dev_stat_grps {
};
struct se_device {
#define SE_DEV_LINK_MAGIC 0xfeeddeef
u32 dev_link_magic;
/* RELATIVE TARGET PORT IDENTIFER Counter */
u16 dev_rpti_counter;
/* Used for SAM Task Attribute ordering */
@ -722,6 +724,8 @@ struct se_port_stat_grps {
};
struct se_lun {
#define SE_LUN_LINK_MAGIC 0xffff7771
u32 lun_link_magic;
/* See transport_lun_status_table */
enum transport_lun_status_table lun_status;
u32 lun_access;