linux-kernel - [PATCH v2 4/6] phy: core: Fix an OF node refcount leakage in _of_phy

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Message-Id: <20241024-phy_core_fix-v2-4-fc0c63dbfcf3@quicinc.com>
Date: Thu, 24 Oct 2024 22:39:29 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Felipe Balbi <balbi@...com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Lee Jones <lee@...nel.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Christophe JAILLET <christophe.jaillet@...adoo.fr>, 
 Zijun Hu <zijun_hu@...oud.com>, stable@...r.kernel.org, 
 linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH v2 4/6] phy: core: Fix an OF node refcount leakage in
 _of_phy_get()

From: Zijun Hu <quic_zijuhu@...cinc.com>

It will leak refcount of OF node @args.np for _of_phy_get() not to
decrease refcount increased by previous of_parse_phandle_with_args()
when returns due to of_device_is_compatible() error.

Fix by adding of_node_put() before the error return.

Fixes: b7563e2796f8 ("phy: work around 'phys' references to usb-nop-xceiv devices")
Cc: stable@...r.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/phy/phy-core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 52ca590a58b9..967878b78797 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -629,8 +629,11 @@ static struct phy *_of_phy_get(struct device_node *np, int index)
 		return ERR_PTR(-ENODEV);

 	/* This phy type handled by the usb-phy subsystem for now */
-	if (of_device_is_compatible(args.np, "usb-nop-xceiv"))
+	if (of_device_is_compatible(args.np, "usb-nop-xceiv")) {
+		/* Put refcount above of_parse_phandle_with_args() got */
+		of_node_put(args.np);
 		return ERR_PTR(-ENODEV);
+	}

 	mutex_lock(&phy_provider_mutex);
 	phy_provider = of_phy_provider_lookup(args.np);

-- 
2.34.1