From: Mike Christie michael.christie@oracle.com
[ Upstream commit 02dd4914b0bcb8fd8f8cad9817f5715a17466261 ]
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@... 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/target/target_core_transport.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index ff26ab0a5f600..d47619a5d172e 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -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); }