linux-kernel - [PATCH 1/3] Input: goodix - Fix double free on managed resource

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Message-Id: <20220422161709.30198-1-jose.exposito89@gmail.com>
Date:   Fri, 22 Apr 2022 18:17:07 +0200
From:   José Expósito <jose.exposito89@...il.com>
To:     hadess@...ess.net
Cc:     hdegoede@...hat.com, dmitry.torokhov@...il.com,
        rydberg@...math.org, lains@...eup.net, jikos@...nel.org,
        benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        José Expósito <jose.exposito89@...il.com>
Subject: [PATCH 1/3] Input: goodix - Fix double free on managed resource

As described in the documentation for devm_input_allocate_device():

  Managed input devices do not need to be explicitly unregistered or
  freed as it will be done automatically when owner device unbinds from
  its driver (or binding fails).

However this driver was explicitly freeing the input device.

Remove the calls to input_free_device() to avoid a possible double free
error.

Fixes: 5ede7f0cfb93f ("Input: goodix - add pen support")
Signed-off-by: José Expósito <jose.exposito89@...il.com>
---
 drivers/input/touchscreen/goodix.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index 752e8ba4fecb..61eb69f3a259 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -308,10 +308,8 @@ static struct input_dev *goodix_create_pen_input(struct goodix_ts_data *ts)
 		return NULL;
 
 	input_alloc_absinfo(input);
-	if (!input->absinfo) {
-		input_free_device(input);
+	if (!input->absinfo)
 		return NULL;
-	}
 
 	input->absinfo[ABS_X] = ts->input_dev->absinfo[ABS_MT_POSITION_X];
 	input->absinfo[ABS_Y] = ts->input_dev->absinfo[ABS_MT_POSITION_Y];
@@ -340,10 +338,8 @@ static struct input_dev *goodix_create_pen_input(struct goodix_ts_data *ts)
 		input->id.product = 0x1001;
 	input->id.version = ts->version;
 
-	if (input_register_device(input) != 0) {
-		input_free_device(input);
+	if (input_register_device(input) != 0)
 		return NULL;
-	}
 
 	return input;
 }
-- 
2.25.1