linux-kernel - [PATCH] NTB: EPF: fix possible memory leak in pci_vntb

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Date:   Wed, 9 Nov 2022 17:28:52 +0800
From:   ruanjinjie <ruanjinjie@...wei.com>
To:     <jdmason@...zu.us>, <dave.jiang@...el.com>, <allenbh@...il.com>,
        <lpieralisi@...nel.org>, <kw@...ux.com>, <mani@...nel.org>,
        <kishon@...nel.org>, <bhelgaas@...gle.com>, <ntb@...ts.linux.dev>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH] NTB: EPF: fix possible memory leak in pci_vntb_probe()

As ntb_register_device() don't handle error of device_register(),
if ntb_register_device() returns error in pci_vntb_probe(), name of kobject
which is allocated in dev_set_name() called in device_add() is leaked.

As comment of device_add() says, it should call put_device() to drop the
reference count that was set in device_initialize()
when it fails, so the name can be freed in kobject_cleanup().

Signed-off-by: ruanjinjie <ruanjinjie@...wei.com>
---
 drivers/pci/endpoint/functions/pci-epf-vntb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c
index 0ea85e1d292e..5aeb028281aa 100644
--- a/drivers/pci/endpoint/functions/pci-epf-vntb.c
+++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c
@@ -1266,6 +1266,7 @@ static int pci_vntb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	return 0;
 
 err_register_dev:
+	put_device(&ndev->ntb.dev);
 	return -EINVAL;
 }
 
-- 
2.25.1