linux-kernel - [PATCH 03/15] ARM: exynos: fix a leaked reference by addingmissing of_node

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Date:   Fri, 1 Mar 2019 16:56:44 +0800
From:   Wen Yang <wen.yang99@....com.cn>
To:     liviu.dudau@....com
Cc:     sudeep.holla@....com, lorenzo.pieralisi@....com,
        linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kgene@...nel.org, krzk@...nel.org,
        linux-samsung-soc@...r.kernel.org, michal.simek@...inx.com,
        afaerber@...e.de, manivannan.sadhasivam@...aro.org,
        dinguyen@...nel.org, heiko@...ech.de,
        linux-rockchip@...ts.infradead.org, f.fainelli@...il.com,
        rjui@...adcom.com, sbranden@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com, linus.walleij@...aro.org,
        avifishman70@...il.com, tmaimon77@...il.com, venture@...gle.com,
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        openbmc@...ts.ozlabs.org, xuwei5@...ilicon.com,
        maxime.ripard@...tlin.com, wens@...e.org, catalin.marinas@....com,
        will.deacon@....com, horms@...ge.net.au, magnus.damm@...il.com,
        linux-renesas-soc@...r.kernel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de,
        fabio.estevam@....com, linux-imx@....com, wang.yi59@....com.cn,
        Wen Yang <wen.yang99@....com.cn>
Subject: [PATCH 03/15] ARM: exynos: fix a leaked reference by addingmissing of_node_put

The call to of_get_next_child returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./arch/arm/mach-exynos/firmware.c:201:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 193, but without a corresponding object release within this function.
./arch/arm/mach-exynos/firmware.c:204:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 193, but without a corresponding object release within this function.
./arch/arm/mach-exynos/suspend.c:642:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 634, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Cc: Russell King <linux@...linux.org.uk>
Cc: Kukjin Kim <kgene@...nel.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-samsung-soc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 arch/arm/mach-exynos/firmware.c | 1 +
 arch/arm/mach-exynos/suspend.c  | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
index d602e3b..2eaf2db 100644
--- a/arch/arm/mach-exynos/firmware.c
+++ b/arch/arm/mach-exynos/firmware.c
@@ -196,6 +196,7 @@ bool __init exynos_secure_firmware_available(void)
 		return false;
 
 	addr = of_get_address(nd, 0, NULL, NULL);
+	of_node_put(nd);
 	if (!addr) {
 		pr_err("%s: No address specified.\n", __func__);
 		return false;
diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c
index 0850505..9afb0c6 100644
--- a/arch/arm/mach-exynos/suspend.c
+++ b/arch/arm/mach-exynos/suspend.c
@@ -639,8 +639,10 @@ void __init exynos_pm_init(void)
 
 	if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
+		of_node_put(np);
 		return;
 	}
+	of_node_put(np);
 
 	pm_data = (const struct exynos_pm_data *) match->data;
 
-- 
2.9.5