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Subject[PATCH] iio: maxim_thermocouple: return -EINVAL on invalid read size
Date
From: Colin Ian King <colin.king@canonical.com>

In the case that the read size is not 2 or 4 bytes
then maxim_thermocouple_read is not initializing ret and
hence may return early with a bogus error return or
just through to return with a bogos unread value in *val.
Fix this by setting ret to -EINVAL for invalid (unhandled)
read sizes.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/iio/temperature/maxim_thermocouple.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c
index 066161a..f962f31 100644
--- a/drivers/iio/temperature/maxim_thermocouple.c
+++ b/drivers/iio/temperature/maxim_thermocouple.c
@@ -136,6 +136,8 @@ static int maxim_thermocouple_read(struct maxim_thermocouple_data *data,
ret = spi_read(data->spi, (void *)&buf32, storage_bytes);
*val = be32_to_cpu(buf32);
break;
+ default:
+ ret = -EINVAL;
}

if (ret)
--
2.9.3
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