linux-kernel - [PATCH] Input: usbtouchscreen - Return directly after a failed kmalloc() in nexio

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Date: Tue, 26 Dec 2023 21:08:12 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Oliver Graute <oliver.graute@...oconnector.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 ye xingchen <ye.xingchen@....com.cn>
Cc: LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr
Subject: [PATCH] Input: usbtouchscreen - Return directly after a failed
 kmalloc() in nexio_init()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 26 Dec 2023 21:00:25 +0100

The kfree() function was called in one case by
the nexio_init() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

Thus return directly after a call of the function “kmalloc” failed
at the beginning.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/input/touchscreen/usbtouchscreen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index 60354ebc7242..1873c7918a78 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -977,7 +977,7 @@ static int nexio_init(struct usbtouch_usb *usbtouch)

 	buf = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
 	if (!buf)
-		goto out_buf;
+		return ret;

 	/* two empty reads */
 	for (i = 0; i < 2; i++) {
--
2.43.0