[PATCH 6.6 280/538] Input: ilitek_ts_i2c - add report id message validation

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Emanuele Ghidoli <emanuele.ghidoli@xxxxxxxxxxx>

[ Upstream commit 208989744a6f01bed86968473312d4e650e600b3 ]

Ensure that the touchscreen response has correct "report id" byte
before processing the touch data and discard other messages.

Fixes: 42370681bd46 ("Input: Add support for ILITEK Lego Series")
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@xxxxxxxxxxx>
Signed-off-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240805085511.43955-3-francesco@xxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/input/touchscreen/ilitek_ts_i2c.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/input/touchscreen/ilitek_ts_i2c.c b/drivers/input/touchscreen/ilitek_ts_i2c.c
index f70af5a173b34..e719f5da68bf5 100644
--- a/drivers/input/touchscreen/ilitek_ts_i2c.c
+++ b/drivers/input/touchscreen/ilitek_ts_i2c.c
@@ -37,6 +37,8 @@
 #define ILITEK_TP_CMD_GET_MCU_VER			0x61
 #define ILITEK_TP_CMD_GET_IC_MODE			0xC0
 
+#define ILITEK_TP_I2C_REPORT_ID				0x48
+
 #define REPORT_COUNT_ADDRESS				61
 #define ILITEK_SUPPORT_MAX_POINT			40
 
@@ -163,6 +165,11 @@ static int ilitek_process_and_report_v6(struct ilitek_ts_data *ts)
 		return error;
 	}
 
+	if (buf[0] != ILITEK_TP_I2C_REPORT_ID) {
+		dev_err(dev, "get touch info failed. Wrong id: 0x%02X\n", buf[0]);
+		return -EINVAL;
+	}
+
 	report_max_point = buf[REPORT_COUNT_ADDRESS];
 	if (report_max_point > ts->max_tp) {
 		dev_err(dev, "FW report max point:%d > panel info. max:%d\n",
-- 
2.43.0







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