linux-kernel - [PATCH] [ARM] fix reference leak in locomo_init_one

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Message-Id: <20250105111156.277058-1-make24@iscas.ac.cn>
Date: Sun,  5 Jan 2025 19:11:56 +0800
From: Ma Ke <make24@...as.ac.cn>
To: linux@...linux.org.uk,
	sumit.garg@...aro.org,
	make24@...as.ac.cn,
	gregkh@...uxfoundation.org,
	elder@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] [ARM] fix reference leak in locomo_init_one_child()

Once device_register() failed, we should call put_device() to
decrement reference count for cleanup. Or it could cause memory leak.

device_register() includes device_add(). As comment of device_add()
says, 'if device_add() succeeds, you should call device_del() when you
want to get rid of it. If device_add() has not succeeded, use only
put_device() to drop the reference count'.

Found by code review.

Cc: stable@...r.kernel.org
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
 arch/arm/common/locomo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index cb6ef449b987..7274010218ec 100644
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -255,6 +255,7 @@ locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
 
 	ret = device_register(&dev->dev);
 	if (ret) {
+		put_device(&dev->dev);
  out:
 		kfree(dev);
 	}
-- 
2.25.1