linux-kernel - [PATCH] [v2] HID: elan: Fix memleak in elan_input

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Date:   Mon, 31 Aug 2020 17:06:43 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] HID: elan: Fix memleak in elan_input_configured

When input_mt_init_slots() fails, input should be freed
to prevent memleak. When input_register_device() fails,
we should call input_mt_destroy_slots() to free memory
allocated by input_mt_init_slots().

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: - Add input_mt_destroy_slots() on failure of
      input_register_device().
---
 drivers/hid/hid-elan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hid/hid-elan.c b/drivers/hid/hid-elan.c
index 45c4f888b7c4..dae193749d44 100644
--- a/drivers/hid/hid-elan.c
+++ b/drivers/hid/hid-elan.c
@@ -188,6 +188,7 @@ static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)
 	ret = input_mt_init_slots(input, ELAN_MAX_FINGERS, INPUT_MT_POINTER);
 	if (ret) {
 		hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
+		input_free_device(input);
 		return ret;
 	}
 
@@ -198,6 +199,7 @@ static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)
 	if (ret) {
 		hid_err(hdev, "Failed to register elan input device: %d\n",
 			ret);
+		input_mt_destroy_slots(input);
 		input_free_device(input);
 		return ret;
 	}
-- 
2.17.1