Fix array overflow in exploding_fireworks#4289
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softhack007 merged 1 commit intowled:0_15from Nov 18, 2024
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Attempt to allocate enough room for the "minimum" sparks; and ensure that we never overrun the allocated array size. Fixes wled#4120
DedeHai
approved these changes
Nov 17, 2024
blazoncek
reviewed
Nov 19, 2024
| int maxSparks = maxData / sizeof(spark); //ESP8266: max. 21/42/85 sparks/seg, ESP32: max. 53/106/213 sparks/seg | ||
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| unsigned numSparks = min(2 + ((rows*cols) >> 1), maxSparks); | ||
| unsigned numSparks = min(5 + ((rows*cols) >> 1), maxSparks); |
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This change alone would be sufficient IMO. It will guarantee that minimum size is 5
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True. I do prefer to be absolutely explicit at the point of usage as well, though - it's saved me a couple times as I don't always remember the subtle relationships between static constants in future refactors.
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Attempt to allocate enough room for the "minimum" sparks; and ensure that we never overrun the allocated array size.
Fixes #4120