linux-kernel - [PATCH AUTOSEL 4.19] i2c: sun6i-p2wi: Prevent potential division by zero

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Message-ID: <20231112132450.174882-1-sashal@kernel.org>
Date:   Sun, 12 Nov 2023 08:24:50 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Axel Lin <axel.lin@...ics.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>,
        andi.shyti@...nel.org, wens@...e.org, jernej.skrabec@...il.com,
        samuel@...lland.org, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH AUTOSEL 4.19] i2c: sun6i-p2wi: Prevent potential division by zero

From: Axel Lin <axel.lin@...ics.com>

[ Upstream commit 5ac61d26b8baff5b2e5a9f3dc1ef63297e4b53e7 ]

Make sure we don't OOPS in case clock-frequency is set to 0 in a DT. The
variable set here is later used as a divisor.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-sun6i-p2wi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-sun6i-p2wi.c b/drivers/i2c/busses/i2c-sun6i-p2wi.c
index 7c07ce116e384..540c33f4e3500 100644
--- a/drivers/i2c/busses/i2c-sun6i-p2wi.c
+++ b/drivers/i2c/busses/i2c-sun6i-p2wi.c
@@ -202,6 +202,11 @@ static int p2wi_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	if (clk_freq == 0) {
+		dev_err(dev, "clock-frequency is set to 0 in DT\n");
+		return -EINVAL;
+	}
+
 	if (of_get_child_count(np) > 1) {
 		dev_err(dev, "P2WI only supports one slave device\n");
 		return -EINVAL;
-- 
2.42.0