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Fix double-free on cleanup and general nonsense when deleting fingers

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Susko3
2024-05-20 19:35:24 +02:00
committed by Sam Lantinga
parent 71050341d4
commit 9458dc07dc
1 changed files with 5 additions and 0 deletions
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src/events/SDL_touch.c
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@@ -241,7 +241,12 @@ static int SDL_DelFinger(SDL_Touch *touch, SDL_FingerID fingerid)
} }
if (index < (touch->num_fingers - 1)) { if (index < (touch->num_fingers - 1)) {
// Move the deleted finger to the end of the active fingers array and shift the active fingers by one.
// This ensures that the descriptor for the now-deleted finger is located at `touch->fingers[touch->num_fingers]` (after the decrement below)
// and is ready for use in SDL_AddFinger.
SDL_Finger *deleted_finger = touch->fingers[index];
SDL_memmove(&touch->fingers[index], &touch->fingers[index + 1], (touch->num_fingers - index - 1) * sizeof(touch->fingers[index])); SDL_memmove(&touch->fingers[index], &touch->fingers[index + 1], (touch->num_fingers - index - 1) * sizeof(touch->fingers[index]));
touch->fingers[touch->num_fingers - 1] = deleted_finger;
} }
--touch->num_fingers; --touch->num_fingers;
return 0; return 0;