From: Luo Yifan <luoyifan@cmss.chinamobile.com>
Date: Thu, 7 Nov 2024 01:59:36 +0000 (+0800)
Subject: ASoC: stm: Prevent potential division by zero in stm32_sai_get_clk_div()
X-Git-Tag: v5.10.231~413
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=444c9d41210c4c53a26e474cb66a6603e42fc394;p=thirdparty%2Fkernel%2Fstable.git

ASoC: stm: Prevent potential division by zero in stm32_sai_get_clk_div()

[ 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@cmss.chinamobile.com>
Reviewed-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://patch.msgid.link/20241107015936.211902-1-luoyifan@cmss.chinamobile.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 3a7f0102b4c5c..90e4757f76b0f 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -319,7 +319,7 @@ 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;
 	}