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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/input/mouse/elantech.c
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@@ -674,10 +674,11 @@
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 	struct input_dev *dev = psmouse->dev;
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 	struct elantech_data *etd = psmouse->private;
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 	unsigned char *packet = psmouse->packet;
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-	int id = ((packet[3] & 0xe0) >> 5) - 1;
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+	int id;
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 	int pres, traces;
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-	if (id < 0)
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+	id = ((packet[3] & 0xe0) >> 5) - 1;
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+	if (id < 0 || id >= ETP_MAX_FINGERS)
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 		return;
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 	etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
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@@ -707,7 +708,7 @@
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 	int id, sid;
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 	id = ((packet[0] & 0xe0) >> 5) - 1;
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-	if (id < 0)
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+	if (id < 0 || id >= ETP_MAX_FINGERS)
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 		return;
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 	sid = ((packet[3] & 0xe0) >> 5) - 1;
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@@ -728,7 +729,7 @@
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 	input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
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 	input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
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-	if (sid >= 0) {
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+	if (sid >= 0 && sid < ETP_MAX_FINGERS) {
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 		etd->mt[sid].x += delta_x2 * weight;
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 		etd->mt[sid].y -= delta_y2 * weight;
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 		input_mt_slot(dev, sid);