linux-kernel - [PATCH AUTOSEL 4.14 5/5] powerpc/pseries: fix possible memory leak in ibmebus_bus

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Date:   Fri,  8 Sep 2023 20:24:40 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     ruanjinjie <ruanjinjie@...wei.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>, gregkh@...uxfoundation.org,
        wei.liu@...nel.org, iwona.winiarska@...el.com, robh@...nel.org,
        sfr@...b.auug.org.au, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 4.14 5/5] powerpc/pseries: fix possible memory leak in ibmebus_bus_init()

From: ruanjinjie <ruanjinjie@...wei.com>

[ Upstream commit afda85b963c12947e298ad85d757e333aa40fd74 ]

If device_register() returns error in ibmebus_bus_init(), 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>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://msgid.link/20221110011929.3709774-1-ruanjinjie@huawei.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/powerpc/platforms/pseries/ibmebus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/platforms/pseries/ibmebus.c b/arch/powerpc/platforms/pseries/ibmebus.c
index 408a860441330..a3d6d064754e8 100644
--- a/arch/powerpc/platforms/pseries/ibmebus.c
+++ b/arch/powerpc/platforms/pseries/ibmebus.c
@@ -452,6 +452,7 @@ static int __init ibmebus_bus_init(void)
 	if (err) {
 		printk(KERN_WARNING "%s: device_register returned %i\n",
 		       __func__, err);
+		put_device(&ibmebus_bus_device);
 		bus_unregister(&ibmebus_bus_type);
 
 		return err;
-- 
2.40.1