[PATCH] ALSA: rockchip_i2s: fix a possible divide-by-zero bug in rockchip_i2s_hw_params()
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;
On Mon, 7 Sep 2020 21:09:37 +0800, Tuo Li wrote:
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;
[...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ALSA: rockchip_i2s: fix a possible divide-by-zero bug in rockchip_i2s_hw_params() commit: 375e2c352582442783178e6a33c279d6bc9354a2
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark
participants (2)
-
Mark Brown -
Tuo Li