| Message ID | 20200830095106.4412-1-t-li20@mails.tsinghua.edu.cn |
|---|---|
| State | New |
| Headers | show |
| Series | ALSA: rockchip: fix a possible divide-by-zero bug in rockchip_i2s_hw_params() | expand |
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c index d1438753edb4..dd0836c32639 100644 --- a/sound/soc/rockchip/rockchip_i2s.c +++ b/sound/soc/rockchip/rockchip_i2s.c @@ -279,7 +279,9 @@ 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) + return -EINVAL; + if (mclk_rate % bclk_rate) return -EINVAL; div_bclk = mclk_rate / bclk_rate;
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 <t-li20@mails.tsinghua.edu.cn> --- sound/soc/rockchip/rockchip_i2s.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)