linux-kernel - [PATCH 3/3] of: irq: release the node after looking up for "interrupts-extended"

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Date:   Wed, 1 Mar 2023 19:52:09 +0100
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     <saravanak@...gle.com>, <clement.leger@...tlin.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        <zajec5@...il.com>, Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Marc Zyngier <maz@...nel.org>, <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Nishanth Menon <nm@...com>, <ssantosh@...nel.org>,
        <mathias.nyman@...el.com>, <gregkh@...uxfoundation.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>
CC:     <linux-renesas-soc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-wireless@...r.kernel.org>,
        <linux-actions@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>, <linux-sunxi@...ts.linux.dev>,
        <devicetree@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH 3/3] of: irq: release the node after looking up for "interrupts-extended"

When of_parse_phandle_with_args() succeeds, a get() is performed on
out_irq->np. And another get() is performed in of_irq_parse_raw(),
resulting in the refcount being incremented twice.
Fixing this by calling put() after of_irq_parse_raw().

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
---
 drivers/of/irq.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 95da943fcf075..244f240bc4ac4 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -349,8 +349,12 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar
 	/* Try the new-style interrupts-extended first */
 	res = of_parse_phandle_with_args(device, "interrupts-extended",
 					"#interrupt-cells", index, out_irq);
-	if (!res)
-		return of_irq_parse_raw(addr, out_irq);
+	if (!res) {
+		p = out_irq->np;
+		res = of_irq_parse_raw(addr, out_irq);
+		of_node_put(p);
+		return res;
+	}
 
 	/* Look for the interrupt parent. */
 	p = of_irq_find_parent(device);
-- 
2.25.1