linux-kernel - [PATCH AUTOSEL 5.4 4/5] ASoC: stm: Prevent potential division by zero in stm32_sai_get_clk

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Message-ID: <20241112103817.1654333-4-sashal@kernel.org>
Date: Tue, 12 Nov 2024 05:38:14 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Luo Yifan <luoyifan@...s.chinamobile.com>,
	Olivier Moysan <olivier.moysan@...s.st.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	arnaud.pouliquen@...s.st.com,
	lgirdwood@...il.com,
	perex@...ex.cz,
	tiwai@...e.com,
	mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 4/5] ASoC: stm: Prevent potential division by zero in stm32_sai_get_clk_div()

From: Luo Yifan <luoyifan@...s.chinamobile.com>

[ Upstream commit 23569c8b314925bdb70dd1a7b63cfe6100868315 ]

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 is safe to perform.

Signed-off-by: Luo Yifan <luoyifan@...s.chinamobile.com>
Reviewed-by: Olivier Moysan <olivier.moysan@...s.st.com>
Link: https://patch.msgid.link/20241107015936.211902-1-luoyifan@cmss.chinamobile.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/stm/stm32_sai_sub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index b7dc9d3192597..e8cd58c0838ee 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -318,7 +318,7 @@ static int stm32_sai_get_clk_div(struct stm32_sai_sub_data *sai,
 	int div;
 
 	div = DIV_ROUND_CLOSEST(input_rate, output_rate);
-	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
+	if (div > SAI_XCR1_MCKDIV_MAX(version) || div <= 0) {
 		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
 		return -EINVAL;
 	}
-- 
2.43.0