From: Tuo Li <tuoli96@outlook.com>
To: lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz,
tiwai@suse.com, heiko@sntech.de, islituo@163.com,
baijiaju1990@163.com
Cc: linux-rockchip@lists.infradead.org, alsa-devel@alsa-project.org,
Tuo Li <tuoli96@outlook.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ALSA: rockchip_i2s: fix a possible divide-by-zero bug in rockchip_i2s_hw_params()
Date: Mon, 7 Sep 2020 21:09:37 +0800 [thread overview]
Message-ID: <TY2PR04MB4029799E60A5BCAAD5B7B5BBB8280@TY2PR04MB4029.apcprd04.prod.outlook.com> (raw)
The variable bclk_rate is checked in:
if (bclk_rate && mclk_rate % bclk_rate)
This indicates that bclk_rate can be zero.
If so, a divide-by-zero bug will occur:
div_bclk = mclk_rate / bclk_rate;
To fix this possible bug, the function returns -EINVAL when bclk_rate is
zero.
Signed-off-by: Tuo Li <tuoli96@outlook.com>
---
sound/soc/rockchip/rockchip_i2s.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index d1438753edb4..593299675b8c 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -279,7 +279,7 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
if (i2s->is_master_mode) {
mclk_rate = clk_get_rate(i2s->mclk);
bclk_rate = 2 * 32 * params_rate(params);
- if (bclk_rate && mclk_rate % bclk_rate)
+ if (bclk_rate == 0 || mclk_rate % bclk_rate)
return -EINVAL;
div_bclk = mclk_rate / bclk_rate;
--
2.17.1
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next reply other threads:[~2020-09-07 13:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-07 13:09 Tuo Li [this message]
2020-09-14 14:51 ` [PATCH] ALSA: rockchip_i2s: fix a possible divide-by-zero bug in rockchip_i2s_hw_params() Mark Brown
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