drivers:adc:ad7768-1: Add a check for data_size argument value in ad77681_compute_xor()

Signed-off-by: Anush Shetty <[email protected]>

Author: Shetty-Anush

drivers/adc/ad7768-1/ad77681.c

@@ -83,6 +83,9 @@ uint8_t ad77681_compute_xor(uint8_t *data,
 	uint8_t buf[3];
 	uint8_t i;
 
+	if (data_size > 3)
+		return -EINVAL;
+
 	for (i = 0; i < data_size; i++) {
 		buf[i] = *data;
 		crc ^= buf[i];