linux-kernel - [RFC] scsi: ch: add scsi_device_put in ch

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Message-Id: <20220719075442.6215-1-yanghao_ht@163.com>
Date:   Tue, 19 Jul 2022 15:54:42 +0800
From:   Yang Hao <yanghao_ht@....com>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yang Hao <yanghao_ht@....com>
Subject: [RFC] scsi: ch: add scsi_device_put in ch_readconfig

ch_probe
  ch_readconfig
    scsi_device_lookup
      scsi_device_get
      ...

when the dev is found, the related refcnt of dev will increase,
and there is no 'scsi_device_put' to decrease it, which will lead
to refcnt leak.

Signed-off-by: Yang Hao <yanghao_ht@....com>
---
 drivers/scsi/ch.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 27012908b..70ba5d63e 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -407,6 +407,8 @@ ch_readconfig(scsi_changer *ch)
 					ch->dt[elem]->vendor,
 					ch->dt[elem]->model,
 					ch->dt[elem]->rev);
+				scsi_device_put(ch->dt[elem]);
+				ch->dt[elem] = NULL;
 			}
 		}
 	}
-- 
2.25.1