davinci: light: Avoid uint32_t underflow

Change-Id: If4f9360cc301ee8ba9f432dbbe3379c2c634c574
2019-09-06 13:47:29 +02:00 · 2019-09-06 13:47:29 +02:00 · feedda1d84
commit feedda1d84
parent e5440961f0
1 changed files with 4 additions and 0 deletions
--- a/light/Light.cpp
+++ b/light/Light.cpp
@ -74,6 +74,10 @@ static uint32_t getBrightness(const LightState& state) {
 }

 static inline uint32_t scaleBrightness(uint32_t brightness, uint32_t maxBrightness) {
+    if (brightness == 0) {
+        return 0;
+    }
+
    return (brightness - 1) * (maxBrightness - 1) / (0xFF - 1) + 1;
 }