* [PATCH][4.9.y] iio: tsl2583: Fix division by a zero lux_val
@ 2021-05-20 11:15 Colin King
2021-05-24 12:47 ` Greg Kroah-Hartman
0 siblings, 1 reply; 2+ messages in thread
From: Colin King @ 2021-05-20 11:15 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: kernel-janitors, Stable, Nobuhiro Iwamatsu
From: Colin Ian King <colin.king@canonical.com>
commit af0e1871d79cfbb91f732d2c6fa7558e45c31038 upstream.
The lux_val returned from tsl2583_get_lux can potentially be zero,
so check for this to avoid a division by zero and an overflowed
gain_trim_val.
Fixes clang scan-build warning:
drivers/iio/light/tsl2583.c:345:40: warning: Either the
condition 'lux_val<0' is redundant or there is division
by zero at line 345. [zerodivcond]
Fixes: ac4f6eee8fe8 ("staging: iio: TAOS tsl258x: Device driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[iwamatsu: Change file path.]
[Colin Ian King: minor context adjustments for 4.9.y]
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
---
drivers/staging/iio/light/tsl2583.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
index 08f1583ee34e..fb3ec56d45b6 100644
--- a/drivers/staging/iio/light/tsl2583.c
+++ b/drivers/staging/iio/light/tsl2583.c
@@ -382,6 +382,15 @@ static int taos_als_calibrate(struct iio_dev *indio_dev)
dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
return lux_val;
}
+
+ /* Avoid division by zero of lux_value later on */
+ if (lux_val == 0) {
+ dev_err(&chip->client->dev,
+ "%s: lux_val of 0 will produce out of range trim_value\n",
+ __func__);
+ return -ENODATA;
+ }
+
gain_trim_val = (unsigned int)(((chip->taos_settings.als_cal_target)
* chip->taos_settings.als_gain_trim) / lux_val);
--
2.31.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH][4.9.y] iio: tsl2583: Fix division by a zero lux_val
2021-05-20 11:15 [PATCH][4.9.y] iio: tsl2583: Fix division by a zero lux_val Colin King
@ 2021-05-24 12:47 ` Greg Kroah-Hartman
0 siblings, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2021-05-24 12:47 UTC (permalink / raw)
To: Colin King; +Cc: kernel-janitors, Stable, Nobuhiro Iwamatsu
On Thu, May 20, 2021 at 12:15:52PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> commit af0e1871d79cfbb91f732d2c6fa7558e45c31038 upstream.
>
> The lux_val returned from tsl2583_get_lux can potentially be zero,
> so check for this to avoid a division by zero and an overflowed
> gain_trim_val.
>
> Fixes clang scan-build warning:
>
> drivers/iio/light/tsl2583.c:345:40: warning: Either the
> condition 'lux_val<0' is redundant or there is division
> by zero at line 345. [zerodivcond]
>
> Fixes: ac4f6eee8fe8 ("staging: iio: TAOS tsl258x: Device driver")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> Cc: <Stable@vger.kernel.org>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> [iwamatsu: Change file path.]
> [Colin Ian King: minor context adjustments for 4.9.y]
> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
> ---
> drivers/staging/iio/light/tsl2583.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
Now queued up, thanks.
greg k-
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