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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Xogium <contact@xogium.me>, Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 17/24] serial: stm32: bail if clock_get_rate returns zero
Date: Sun, 20 Feb 2022 13:47:29 +0100	[thread overview]
Message-ID: <20220220124736.3052502-18-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20220220124736.3052502-1-a.fatoum@pengutronix.de>

While this shouldn't happen in a well-behaving system, with SCMI barebox
may become dependent on the firmware to provide a non-zero rate here.

Sanitize the value to avoid a division -by-zero.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/serial/serial_stm32.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c
index 271897f1743c..f1d4c6de9074 100644
--- a/drivers/serial/serial_stm32.c
+++ b/drivers/serial/serial_stm32.c
@@ -41,6 +41,8 @@ static int stm32_serial_setbaudrate(struct console_device *cdev, int baudrate)
 	unsigned long clock_rate;
 
 	clock_rate = clk_get_rate(stm32->clk);
+	if (!clock_rate)
+		return -EINVAL;
 
 	int_div = DIV_ROUND_CLOSEST(clock_rate, baudrate);
 
-- 
2.30.2


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  parent reply	other threads:[~2022-02-20 12:51 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-20 12:47 [PATCH 00/24] ARM: stm32mp: add trusted bootchain (SCMI&FIP) support Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 01/24] PBL: fdt: factor reg property parsing into helper Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 02/24] pinctrl: stm32: use gpio-ranges instead of alias Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 03/24] ARM: stm32mp: simplify with build_stm32mp_image macro Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 04/24] ARM: stm32mp: change stm32image extension to .stm32 Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 05/24] filetype: detect TF-A Firmware Image Packages (FIP) Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 06/24] scripts: add tool to adjust bl33 load address in existing FIP Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 07/24] ARM: stm32mp: build extra barebox-stm32mp-generic-bl33.img Ahmad Fatoum
2022-02-21 10:35   ` [PATCH] fixup! " Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 08/24] ARM: stm32mp: ddrctrl: fix wrong register field widths Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 09/24] reset: stm32: drop stm32mp1_reset_ops indirection Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 10/24] reset: move stm32 reset code to drivers/power/reset Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 11/24] ARM: smccc: sync header with upstream Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 12/24] firmware: import Linux v5.13 SCMI support Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 13/24] reset: add " Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 14/24] clk: add SCMI clock driver Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 15/24] regulator: add SCMI regulator driver Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 16/24] clk: accept const arguments in clk_to_clk_hw/clk_hw_to_clk Ahmad Fatoum
2022-02-20 12:47 ` Ahmad Fatoum [this message]
2022-02-20 12:47 ` [PATCH 18/24] clk: implement of_clk_hw_{onecell,simple}_get Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 19/24] clk: implement clk_hw_reparent Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 20/24] reset: add support for reset_control_status Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 21/24] clk: stm32mp1: sync with Linux v5.17-rc1 Ahmad Fatoum
2022-02-21 10:35   ` [PATCH] fixup! " Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 22/24] regulator: core: fall back to node name if no regulator-name property Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 23/24] ARM: dts: stm32mp: remove regulator-name override in stm32mp151.dtsi Ahmad Fatoum
2022-02-20 12:47 ` [PATCH 24/24] ARM: stm32mp: enable more config options Ahmad Fatoum
2022-02-23 10:57 ` [PATCH 00/24] ARM: stm32mp: add trusted bootchain (SCMI&FIP) support Sascha Hauer

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