linux-kernel - [PATCH] Input: synaptics-rmi4: Fix maximum size check for F12 control register 8

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Message-ID: <1468971821-16982-1-git-send-email-aduggan@synaptics.com>
Date:	Tue, 19 Jul 2016 16:43:41 -0700
From:	Andrew Duggan <aduggan@...aptics.com>
To:	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Andrew Duggan <aduggan@...aptics.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Vincent Huang <vincent.huang@...synaptics.com>,
	Nick Dyer <nick@...anahar.org>,
	Chris Healy <cphealy@...il.com>,
	Nitin Chaudhary <nitinchaudhary1289@...il.com>,
	<stable@...r.kernel.org>
Subject: [PATCH] Input: synaptics-rmi4: Fix maximum size check for F12 control register 8

According to the RMI4 spec the maximum size of F12 control register 8 is
15 bytes. The current code incorrectly reports an error if control 8 is
greater then 14. Making sensors with a control register 8 with 15 bytes
unusable.

Signed-off-by: Andrew Duggan <aduggan@...aptics.com>
Reported-by: Chris Healy <cphealy@...il.com>
Cc: stable@...r.kernel.org
---
 drivers/input/rmi4/rmi_f12.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/input/rmi4/rmi_f12.c b/drivers/input/rmi4/rmi_f12.c
index c30fd86..9b0d9f7 100644
--- a/drivers/input/rmi4/rmi_f12.c
+++ b/drivers/input/rmi4/rmi_f12.c
@@ -68,7 +68,7 @@ static int rmi_f12_read_sensor_tuning(struct f12_data *f12)
 	struct rmi_device *rmi_dev = fn->rmi_dev;
 	int ret;
 	int offset;
-	u8 buf[14];
+	u8 buf[15];
 	int pitch_x = 0;
 	int pitch_y = 0;
 	int clip_x_low = 0;
@@ -88,8 +88,9 @@ static int rmi_f12_read_sensor_tuning(struct f12_data *f12)
 
 	offset = rmi_register_desc_calc_reg_offset(&f12->control_reg_desc, 8);
 
-	if (item->reg_size > 14) {
-		dev_err(&fn->dev, "F12 control8 should be 14 bytes, not: %ld\n",
+	if (item->reg_size > 15) {
+		dev_err(&fn->dev,
+			"F12 control8 should be a maximum of 15 bytes, not: %ld\n",
 			item->reg_size);
 		return -ENODEV;
 	}
-- 
2.7.4