linux-kernel - [PATCH] ep93xx: clock: Fix off by one in ep93xx_div_recalc

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Message-ID: <a05454f8-e409-4f60-93f7-6aa2ea0a2a23@stanley.mountain>
Date: Wed, 11 Sep 2024 10:39:15 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Nikita Shubin <nikita.shubin@...uefel.me>
Cc: Hartley Sweeten <hsweeten@...ionengravers.com>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	Russell King <linux@...linux.org.uk>, Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] ep93xx: clock: Fix off by one in ep93xx_div_recalc_rate()

The psc->div[] array has psc->num_div elements.  These values come from
when we call clk_hw_register_div().  It's adc_divisors and
ARRAY_SIZE(adc_divisors)) and so on.  So this condition needs to be >=
instead of > to prevent an out of bounds read.

Fixes: 9645ccc7bd7a ("ep93xx: clock: convert in-place to COMMON_CLK")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 arch/arm/mach-ep93xx/clock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-ep93xx/clock.c b/arch/arm/mach-ep93xx/clock.c
index 85a496ddc619..e9f72a529b50 100644
--- a/arch/arm/mach-ep93xx/clock.c
+++ b/arch/arm/mach-ep93xx/clock.c
@@ -359,7 +359,7 @@ static unsigned long ep93xx_div_recalc_rate(struct clk_hw *hw,
 	u32 val = __raw_readl(psc->reg);
 	u8 index = (val & psc->mask) >> psc->shift;
 
-	if (index > psc->num_div)
+	if (index >= psc->num_div)
 		return 0;
 
 	return DIV_ROUND_UP_ULL(parent_rate, psc->div[index]);
-- 
2.45.2