linux-kernel - [PATCH] ASoC: stm: Prevent potential division by zero in stm32_sai_mclk_round

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Message-Id: <20241106014654.206860-1-luoyifan@cmss.chinamobile.com>
Date: Wed,  6 Nov 2024 09:46:54 +0800
From: Luo Yifan <luoyifan@...s.chinamobile.com>
To: olivier.moysan@...s.st.com,
	arnaud.pouliquen@...s.st.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com
Cc: linux-sound@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Luo Yifan <luoyifan@...s.chinamobile.com>
Subject: [PATCH] ASoC: stm: Prevent potential division by zero in stm32_sai_mclk_round_rate()

This patch checks if div is less than or equal to zero (div <= 0). If
div is zero or negative, the function returns -EINVAL, ensuring the
division operation (*prate / div) is safe to perform.

Signed-off-by: Luo Yifan <luoyifan@...s.chinamobile.com>
---
 sound/soc/stm/stm32_sai_sub.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 7bc4a96b7..2570daa3e 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -378,8 +378,8 @@ static long stm32_sai_mclk_round_rate(struct clk_hw *hw, unsigned long rate,
 	int div;
 
 	div = stm32_sai_get_clk_div(sai, *prate, rate);
-	if (div < 0)
-		return div;
+	if (div <= 0)
+		return -EINVAL;
 
 	mclk->freq = *prate / div;
 
-- 
2.27.0