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Merge pull request #4289 from willmmiles/exploding_fireworks_overrun

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Fix array overflow in exploding_fireworks
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Frank 2024-11-18 22:18:19 +01:00 committed by GitHub
commit 545bfa6ef9
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1 changed files with 3 additions and 2 deletions
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wled00/FX.cpp
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@ -3547,7 +3547,7 @@ uint16_t mode_exploding_fireworks(void)
if (segs <= (strip.getMaxSegments() /4)) maxData *= 2; //ESP8266: 1024 if <= 4 segs ESP32: 2560 if <= 8 segs
int maxSparks = maxData / sizeof(spark); //ESP8266: max. 21/42/85 sparks/seg, ESP32: max. 53/106/213 sparks/seg
unsigned numSparks = min(2 + ((rows*cols) >> 1), maxSparks);
unsigned numSparks = min(5 + ((rows*cols) >> 1), maxSparks);
unsigned dataSize = sizeof(spark) * numSparks;
if (!SEGENV.allocateData(dataSize + sizeof(float))) return mode_static(); //allocation failed
float *dying_gravity = reinterpret_cast<float*>(SEGENV.data + dataSize);
@ -3602,7 +3602,8 @@ uint16_t mode_exploding_fireworks(void)
* Size is proportional to the height.
*/
unsigned nSparks = flare->pos + random8(4);
nSparks = constrain(nSparks, 4, numSparks);
nSparks = std::max(nSparks, 4U); // This is not a standard constrain; numSparks is not guaranteed to be at least 4
nSparks = std::min(nSparks, numSparks);
// initialize sparks
if (SEGENV.aux0 == 2) {