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scsi: target: Fix cmd_count ref leak

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percpu_ref_init sets the refcount to 1 and percpu_ref_kill drops it.
Drivers like iSCSI and loop do not call target_sess_cmd_list_set_waiting
during session shutdown, though, so they have been calling percpu_ref_exit
with a refcount still taken and leaking the cmd_counts memory.

Link: https://lore.kernel.org/r/1604257174-4524-3-git-send-email-michael.christie@oracle.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@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 2020-11-01 12:59:28 -06:00 committed by Martin K. Petersen
parent a2b5d6f975
commit 02dd4914b0
1 changed files with 8 additions and 0 deletions
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8
drivers/target/target_core_transport.c
View file

@ -238,6 +238,14 @@ EXPORT_SYMBOL(transport_init_session);
void transport_uninit_session(struct se_session *se_sess)
{
/*
* Drivers like iscsi and loop do not call
* target_sess_cmd_list_set_waiting during session shutdown so we
* have to drop the ref taken at init time here.
*/
if (!se_sess->sess_tearing_down)
percpu_ref_put(&se_sess->cmd_count);
percpu_ref_exit(&se_sess->cmd_count);
}