[PATCH] HID: alps: Fix an error handling path in 'alps_input_configured()'

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: jkosina@suse.cz, benjamin.tissoires@redhat.com, masaki.ota@jp.alps.com
Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Subject: [PATCH] HID: alps: Fix an error handling path in 'alps_input_configured()'
Date: Wed,  4 Dec 2019 04:35:25 +0100	[thread overview]
Message-ID: <20191204033525.10871-1-christophe.jaillet@wanadoo.fr> (raw)

They are issues:
   - if 'input_allocate_device()' fails and return NULL, there is no need
     to free anything and 'input_free_device()' call is a no-op. It can
     be axed.
   - 'ret' is known to be 0 at this point, so we must set it to a
     meaningful value before returning

Fixes: 2562756dde55 ("HID: add Alps I2C HID Touchpad-Stick support")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/hid/hid-alps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-alps.c b/drivers/hid/hid-alps.c
index ae79a7c66737..fa704153cb00 100644
--- a/drivers/hid/hid-alps.c
+++ b/drivers/hid/hid-alps.c
@@ -730,7 +730,7 @@ static int alps_input_configured(struct hid_device *hdev, struct hid_input *hi)
 	if (data->has_sp) {
 		input2 = input_allocate_device();
 		if (!input2) {
-			input_free_device(input2);
+			ret = -ENOMEM;
 			goto exit;
 		}
 
-- 
2.20.1

