[PATCH 5.4 036/214] scsi: target: Fix xcopy sess release leak

Greg Kroah-Hartman
2020-09-01T16:42:37Z

From: Mike Christie <michael.christie@oracle.com>

[ Upstream commit 3c006c7d23aac928279f7cbe83bbac4361255d53 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/target/target_core_internal.h | 1 +
drivers/target/target_core_transport.c | 7 ++++++-
drivers/target/target_core_xcopy.c | 11 +++++++++--
3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 8533444159635..e7b3c6e5d5744 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -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 *,
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 7c78a5d02c083..b1f4be055f838 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -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);
diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c
index b9b1e92c6f8db..9d24e85b08631 100644
--- a/drivers/target/target_core_xcopy.c
+++ b/drivers/target/target_core_xcopy.c
@@ -479,7 +479,7 @@ 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;
@@ -488,12 +488,19 @@ 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);
+ }
}

/*
--
2.25.1