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scsi: target: Fix xcopy sess release leak 

transport_init_session can allocate memory via percpu_ref_init, and
target_xcopy_release_pt never frees it. This adds a
transport_uninit_session function to handle cleanup of resources allocated
in the init function.

Link: https://lore.kernel.org/r/1593654203-12442-3-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 20:43:18 -05:00 committed by Martin K. Petersen
parent 63c9ffe473
commit 3c006c7d23
3 changed files with 16 additions and 3 deletions
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1
drivers/target/target_core_internal.h
View File

@ -138,6 +138,7 @@ int init_se_kmem_caches(void);
void release_se_kmem_caches(void);
u32 scsi_get_new_index(scsi_index_t);
void transport_subsystem_check_init(void);
void transport_uninit_session(struct se_session *);
unsigned char *transport_dump_cmd_direction(struct se_cmd *);
void transport_dump_dev_state(struct se_device *, char *, int *);
void transport_dump_dev_info(struct se_device *, struct se_lun *,

7
drivers/target/target_core_transport.c
View File

@ -236,6 +236,11 @@ int transport_init_session(struct se_session *se_sess)
}
EXPORT_SYMBOL(transport_init_session);
void transport_uninit_session(struct se_session *se_sess)
{
percpu_ref_exit(&se_sess->cmd_count);
}
/**
* transport_alloc_session - allocate a session object and initialize it
* @sup_prot_ops: bitmask that defines which T10-PI modes are supported.
@ -579,7 +584,7 @@ void transport_free_session(struct se_session *se_sess)
sbitmap_queue_free(&se_sess->sess_tag_pool);
kvfree(se_sess->sess_cmd_map);
}
percpu_ref_exit(&se_sess->cmd_count);
transport_uninit_session(se_sess);
kmem_cache_free(se_sess_cache, se_sess);
}
EXPORT_SYMBOL(transport_free_session);

11
drivers/target/target_core_xcopy.c
View File

@ -474,7 +474,7 @@ int target_xcopy_setup_pt(void)
memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
ret = transport_init_session(&xcopy_pt_sess);
if (ret < 0)
return ret;
goto destroy_wq;
xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
@ -483,12 +483,19 @@ int target_xcopy_setup_pt(void)
xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
return 0;
destroy_wq:
destroy_workqueue(xcopy_wq);
xcopy_wq = NULL;
return ret;
}
void target_xcopy_release_pt(void)
{
if (xcopy_wq)
if (xcopy_wq) {
destroy_workqueue(xcopy_wq);
transport_uninit_session(&xcopy_pt_sess);
}
}
/*