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

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Date:   Thu, 10 Nov 2022 09:19:29 +0800
From:   ruanjinjie <ruanjinjie@...wei.com>
To:     <mpe@...erman.id.au>, <npiggin@...il.com>,
        <christophe.leroy@...roup.eu>, <windhl@....com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH] powerpc/pseries: fix possible memory leak in ibmebus_bus_init()

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>
---
 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 a870cada7acd..ed5fc70b7353 100644
--- a/arch/powerpc/platforms/pseries/ibmebus.c
+++ b/arch/powerpc/platforms/pseries/ibmebus.c
@@ -455,6 +455,7 @@ 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;
-- 
2.25.1