linux-kernel - [PATCH v2] drivers: base: transport

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Date:   Thu, 10 Nov 2022 18:23:07 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <open-iscsi@...glegroups.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <lduncan@...e.com>, <cleech@...hat.com>,
        <michael.christie@...cle.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, <yangyingliang@...wei.com>
Subject: [PATCH v2] drivers: base: transport_class: fix possible memory leak

Current some drivers(like iscsi) call transport_register_device()
failed, they don't call transport_destroy_device() to release the
memory allocated in transport_setup_device(), because they don't
know what was done, it should be internal thing to release the
resource in register function. So fix this leak by calling destroy
function inside register function.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
v1 -> v2:
  fix code style.
---
 include/linux/transport_class.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h
index 63076fb835e3..2efc271a96fa 100644
--- a/include/linux/transport_class.h
+++ b/include/linux/transport_class.h
@@ -70,8 +70,14 @@ void transport_destroy_device(struct device *);
 static inline int
 transport_register_device(struct device *dev)
 {
+	int ret;
+
 	transport_setup_device(dev);
-	return transport_add_device(dev);
+	ret = transport_add_device(dev);
+	if (ret)
+		transport_destroy_device(dev);
+
+	return ret;
 }
 
 static inline void
-- 
2.25.1