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target: Don't BUG_ON during NodeACL dynamic -> explicit conversion 

After the v4.2+ RCU conversion to se_node_acl->lun_entry_hlist,
a BUG_ON() was added in core_enable_device_list_for_node() to
detect when the located orig->se_lun_acl contains an existing
se_lun_acl pointer reference.

However, this scenario can happen when a dynamically generated
NodeACL is being converted to an explicit NodeACL, when the
explicit NodeACL contains a different LUN mapping than the
default provided by the WWN endpoint.

So instead of triggering BUG_ON(), go ahead and fail instead
following the original pre RCU conversion logic.

Reported-by: Benjamin ESTRABAUD <ben.estrabaud@mpstor.com>
Cc: Benjamin ESTRABAUD <ben.estrabaud@mpstor.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # 4.2+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2016-10-23 14:28:15 -07:00
parent d5adbfcd5f
commit 391e2a6de9
1 changed files with 9 additions and 1 deletions
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10
drivers/target/target_core_device.c
View File

@ -352,7 +352,15 @@ int core_enable_device_list_for_node(
kfree(new);
return -EINVAL;
}
BUG_ON(orig->se_lun_acl != NULL);
if (orig->se_lun_acl != NULL) {
pr_warn_ratelimited("Detected existing explicit"
" se_lun_acl->se_lun_group reference for %s"
" mapped_lun: %llu, failing\n",
nacl->initiatorname, mapped_lun);
mutex_unlock(&nacl->lun_entry_mutex);
kfree(new);
return -EINVAL;
}
rcu_assign_pointer(new->se_lun, lun);
rcu_assign_pointer(new->se_lun_acl, lun_acl);