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authorNicholas Bellinger <nab@linux-iscsi.org>2016-10-23 14:28:15 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-14 15:22:51 -0800
commit44d03b9280edcaa1bbb28116c3972e1cf144a24e (patch)
tree50fd5d3ad594fbda649f09b2345ea68a5d04de48 /drivers/target
parentfcc038db59597e05030a757c4df8e58d2d8919ab (diff)
target: Don't BUG_ON during NodeACL dynamic -> explicit conversion
commit 391e2a6de9781e4906dd7e0b1cc097050bf43e11 upstream. 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> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_device.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index dcd5ed26eb18..356c80fbb304 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -362,7 +362,15 @@ 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);