linux-kernel - [PATCH] clk: rs9: Reserve 8 struct clk

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Message-ID: <20260118025756.96377-1-marek.vasut+renesas@mailbox.org>
Date: Sun, 18 Jan 2026 03:56:58 +0100
From: Marek Vasut <marek.vasut+renesas@...lbox.org>
To: linux-clk@...r.kernel.org
Cc: Marek Vasut <marek.vasut+renesas@...lbox.org>,
	stable@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org
Subject: [PATCH] clk: rs9: Reserve 8 struct clk_hw slots for for 9FGV0841

The 9FGV0841 has 8 outputs and registers 8 struct clk_hw, make sure
there are 8 slots for those newly registered clk_hw pointers, else
there is going to be out of bounds write when pointers 4..7 are set
into struct rs9_driver_data .clk_dif[4..7] field.

Since there are other structure members past this struct clk_hw
pointer array, writing to .clk_dif[4..7] fields only corrupts the
struct rs9_driver_data content, without crashing the kernel. However,
the kernel does crash when the driver is unbound or during suspend.

Fix this, increase the struct clk_hw pointer array size to the
maximum output count of 9FGV0841, which is the biggest chip that
is supported by this driver.

Cc: stable@...r.kernel.org
Fixes: f0e5e1800204 ("clk: rs9: Add support for 9FGV0841")
Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Marek Vasut <marek.vasut+renesas@...lbox.org>
---
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Michael Turquette <mturquette@...libre.com>
Cc: Stephen Boyd <sboyd@...nel.org>
Cc: linux-clk@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org
---
 drivers/clk/clk-renesas-pcie.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk-renesas-pcie.c b/drivers/clk/clk-renesas-pcie.c
index 4c3a5e4eb77ac..f94a9c4d0b670 100644
--- a/drivers/clk/clk-renesas-pcie.c
+++ b/drivers/clk/clk-renesas-pcie.c
@@ -64,7 +64,7 @@ struct rs9_driver_data {
 	struct i2c_client	*client;
 	struct regmap		*regmap;
 	const struct rs9_chip_info *chip_info;
-	struct clk_hw		*clk_dif[4];
+	struct clk_hw		*clk_dif[8];
 	u8			pll_amplitude;
 	u8			pll_ssc;
 	u8			clk_dif_sr;
-- 
2.51.0