linux-kernel - Re: [PATCH] HID: potential dereference of null pointer

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Message-ID: <CAO-hwJ+VZscrj9yGOkPruuUXXkg4NOPRnj36aa+-+5JvGxGk+w@mail.gmail.com>
Date:   Mon, 20 Dec 2021 15:10:50 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     Jiri Kosina <jikos@...nel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] HID: potential dereference of null pointer

On Wed, Dec 15, 2021 at 9:36 AM Jiasheng Jiang <jiasheng@...as.ac.cn> wrote:
>
> 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")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---

Thanks for the fix. I have now pushed it to hid.git, branch
for-5.16/upstream-fixes

Cheers,
Benjamin

>  drivers/hid/hid-vivaldi.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/hid/hid-vivaldi.c b/drivers/hid/hid-vivaldi.c
> index cd7ada48b1d9..72957a9f7117 100644
> --- a/drivers/hid/hid-vivaldi.c
> +++ b/drivers/hid/hid-vivaldi.c
> @@ -57,6 +57,9 @@ static int vivaldi_probe(struct hid_device *hdev,
>         int ret;
>
>         drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
> +       if (!drvdata)
> +               return -ENOMEM;
> +
>         hid_set_drvdata(hdev, drvdata);
>
>         ret = hid_parse(hdev);
> --
> 2.25.1
>