linux-kernel - Re: [PATCH] Bluetooth: btrtl: Prevent potential NULL dereference

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Message-ID: <cc9f5c30-45a6-4130-bdf3-732e5f1c6d2b@redhat.com>
Date: Wed, 2 Apr 2025 13:55:03 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: Marcel Holtmann <marcel@...tmann.org>,
 Luiz Augusto von Dentz <luiz.dentz@...il.com>,
 Jeremy Cline <jeremy@...ine.org>, linux-bluetooth@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: btrtl: Prevent potential NULL dereference

Hi,

On 2-Apr-25 1:01 PM, Dan Carpenter wrote:
> The btrtl_initialize() function checks that rtl_load_file() either
> had an error or it loaded a zero length file.  However, if it loaded
> a zero length file then the error code is not set correctly.  It
> results in an error pointer vs NULL bug, followed by a NULL pointer
> dereference.  This was detected by Smatch:
> 
> drivers/bluetooth/btrtl.c:592 btrtl_initialize() warn: passing zero to 'ERR_PTR'
> 
> Fixes: 26503ad25de8 ("Bluetooth: btrtl: split the device initialization into smaller parts")
> S

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


igned-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  drivers/bluetooth/btrtl.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
> index d3eba0d4a57d..7838c89e529e 100644
> --- a/drivers/bluetooth/btrtl.c
> +++ b/drivers/bluetooth/btrtl.c
> @@ -1215,6 +1215,8 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
>  			rtl_dev_err(hdev, "mandatory config file %s not found",
>  				    btrtl_dev->ic_info->cfg_name);
>  			ret = btrtl_dev->cfg_len;
> +			if (!ret)
> +				ret = -EINVAL;
>  			goto err_free;
>  		}
>  	}