linux-kernel - [PATCH 5.0 065/122] arm/mach-at91/pm : fix possible object reference leak

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Date:   Mon,  6 May 2019 16:32:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mukesh Ojha <mojha@...eaurora.org>,
        Peng Hao <peng.hao2@....com.cn>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: [PATCH 5.0 065/122] arm/mach-at91/pm : fix possible object reference leak

[ Upstream commit ba5e60c9b75dec92d4c695b928f69300b17d7686 ]

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>
Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 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 51e808adb00c..2a757dcaa1a5 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;
-- 
2.20.1