linux-kernel - [PATCH 5.10 08/76] HID: potential dereference of null pointer

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Message-Id: <20211227151324.999963838@linuxfoundation.org>
Date:   Mon, 27 Dec 2021 16:30:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH 5.10 08/76] HID: potential dereference of null pointer

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

commit 13251ce1dd9bb525da2becb9b26fdfb94ca58659 upstream.

The return value of devm_kzalloc() needs to be checked.
To avoid hdev->dev->driver_data to be null in case of the failure of
alloc.

Fixes: 14c9c014babe ("HID: add vivaldi HID driver")
Cc: stable@...r.kernel.org
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Link: https://lore.kernel.org/r/20211215083605.117638-1-jiasheng@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/hid/hid-vivaldi.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/hid/hid-vivaldi.c
+++ b/drivers/hid/hid-vivaldi.c
@@ -57,6 +57,9 @@ static int vivaldi_probe(struct hid_devi
 	int ret;
 
 	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
 	hid_set_drvdata(hdev, drvdata);
 
 	ret = hid_parse(hdev);