linux-kernel - [PATCH v4] arm/mach-at91/pm : fix possible object reference leak

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Message-Id: <1554214358-113444-1-git-send-email-peng.hao2@zte.com.cn>
Date:   Tue, 2 Apr 2019 22:12:38 +0800
From:   Peng Hao <peng.hao2@....com.cn>
To:     ludovic.desroches@...rochip.com, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, mojha@...eaurora.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Peng Hao <peng.hao2@....com.cn>
Subject: [PATCH v4] arm/mach-at91/pm : fix possible object reference leak

of_find_device_by_node() takes a reference to the struct device
when it finds a match via get_device. When returning error we should
call put_device.

Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Signed-off-by: Peng Hao <peng.hao2@....com.cn>
---
 arch/arm/mach-at91/pm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 51e808a..38511a5 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -591,13 +591,13 @@ static int __init at91_pm_backup_init(void)
 
 	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
 	if (!np)
-		goto securam_fail;
+		goto securam_fail_no_ref_dev;
 
 	pdev = of_find_device_by_node(np);
 	of_node_put(np);
 	if (!pdev) {
 		pr_warn("%s: failed to find securam device!\n", __func__);
-		goto securam_fail;
+		goto securam_fail_no_ref_dev;
 	}
 
 	sram_pool = gen_pool_get(&pdev->dev, NULL);
@@ -620,6 +620,8 @@ static int __init at91_pm_backup_init(void)
 	return 0;
 
 securam_fail:
+	put_device(&pdev->dev);
+securam_fail_no_ref_dev:
 	iounmap(pm_data.sfrbu);
 	pm_data.sfrbu = NULL;
 	return ret;
-- 
1.8.3.1