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scsi: target: Fix crash during SPEC_I_PT handling 

__core_scsi3_add_registration clears the t10_pr_registration pr_reg_deve
and does a core_scsi3_lunacl_undepend_item which does an undepend and also
does a kref_put from the get done in __core_scsi3_alloc_registration. So
when we get to the bottom of core_scsi3_decode_spec_i_port the pr_reg_deve
is NULL and we crash when trying to access the local_pr_reg's pr_reg_deve.
We've also done an extra undepend for local_pr_reg and if we didn't crash
on the NULL we would have done an extra kref_put too.

This patch has us do a core_scsi3_lunacl_depend_item for local_pr_reg and
then let __core_scsi3_add_registration handle the cleanup for the
pr_reg_deve. We then just skip the undepend for the acl and tpg for the
local pr_reg.

The error path then works in a similar way, but we always do the
core_scsi3_lunacl_undepend_item since we never call
__core_scsi3_add_registration in that code path.

Link: https://lore.kernel.org/r/1593654203-12442-4-git-send-email-michael.christie@oracle.com
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2020-07-01 20:43:19 -05:00 committed by Martin K. Petersen
parent 3c006c7d23
commit f32ba612ef
1 changed files with 20 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/target/target_core_pr.c
View File

@ -1521,13 +1521,16 @@ core_scsi3_decode_spec_i_port(
kfree(tidh_new);
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
}
if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {
kfree(tidh_new);
kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
target_pr_kref_release);
kmem_cache_free(t10_pr_reg_cache, local_pr_reg);
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
}
tidh_new->dest_pr_reg = local_pr_reg;
/*
* The local I_T nexus does not hold any configfs dependances,
* so we set tidh_new->dest_se_deve to NULL to prevent the
* configfs_undepend_item() calls in the tid_dest_list loops below.
*/
tidh_new->dest_se_deve = NULL;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
if (cmd->data_length < 28) {
@ -1816,12 +1819,9 @@ core_scsi3_decode_spec_i_port(
dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
dest_se_deve->mapped_lun : 0);
if (!dest_se_deve) {
kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
target_pr_kref_release);
if (dest_pr_reg == local_pr_reg)
continue;
}
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
@ -1835,11 +1835,16 @@ out:
* including *dest_pr_reg and the configfs dependances..
*/
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
bool is_local = false;
dest_tpg = tidh->dest_tpg;
dest_node_acl = tidh->dest_node_acl;
dest_se_deve = tidh->dest_se_deve;
dest_pr_reg = tidh->dest_pr_reg;
if (dest_pr_reg == local_pr_reg)
is_local = true;
list_del(&tidh->dest_list);
kfree(tidh);
/*
@ -1855,13 +1860,11 @@ out:
}
kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
if (!dest_se_deve) {
kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
target_pr_kref_release);
continue;
}
core_scsi3_lunacl_undepend_item(dest_se_deve);
if (is_local)
continue;
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}