linux-kernel - [PATCH] Input: MT - Return directly after a failed kzalloc() in input_mt_init

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Message-ID: <5088a905-4f29-41d3-a96e-5b66aad551f1@web.de>
Date: Tue, 26 Dec 2023 20:43:37 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org,
 Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Henrik Rydberg <rydberg@...math.org>
Cc: LKML <linux-kernel@...r.kernel.org>, cocci@...ia.fr
Subject: [PATCH] Input: MT - Return directly after a failed kzalloc() in
 input_mt_init_slots()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 26 Dec 2023 20:36:09 +0100

The kfree() function was called in one case by
the input_mt_init_slots() 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 “kzalloc” failed
at the beginning.

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

diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
index 14b53dac1253..24064447d600 100644
--- a/drivers/input/input-mt.c
+++ b/drivers/input/input-mt.c
@@ -49,7 +49,7 @@ int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots,

 	mt = kzalloc(struct_size(mt, slots, num_slots), GFP_KERNEL);
 	if (!mt)
-		goto err_mem;
+		return -ENOMEM;

 	mt->num_slots = num_slots;
 	mt->flags = flags;
--
2.43.0