[PATCH v3] iio: light: Add check for array bounds in veml6075_read_int_time_ms

[Karan Sanghavi]

The array contains only 5 elements, but the index calculated by
veml6075_read_int_time_index can range from 0 to 7,
which could lead to out-of-bounds access. The check prevents this issue.

Coverity Issue
CID 1574309: (#1 of 1): Out-of-bounds read (OVERRUN)
overrun-local: Overrunning array veml6075_it_ms of 5 4-byte
elements at element index 7 (byte offset 31) using
index int_index (which evaluates to 7)

Fixes: 3b82f43238ae ("iio: light: add VEML6075 UVA and UVB light sensor driver")
Signed-off-by: Karan Sanghavi <karansanghvi98@xxxxxxxxx>
---
 drivers/iio/light/veml6075.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/veml6075.c b/drivers/iio/light/veml6075.c
index 05d4c0e9015d..5dd951f6e989 100644
--- a/drivers/iio/light/veml6075.c
+++ b/drivers/iio/light/veml6075.c
@@ -201,7 +201,12 @@ static int veml6075_read_int_time_index(struct veml6075_data *data)
 	if (ret < 0)
 		return ret;
 
-	return FIELD_GET(VEML6075_CONF_IT, conf);
+	int int_index = FIELD_GET(VEML6075_CONF_IT, conf);
+
+	if (int_index >= ARRAY_SIZE(veml6075_it_ms))
+		return -EINVAL;
+
+	return int_index;
 }
 
 static int veml6075_read_int_time_ms(struct veml6075_data *data, int *val)
-- 
2.43.0