linux-kernel - Re: [PATCH v2] usb: typec: tipd: Fix dereferencing freed memory 'fw in core.c

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Message-ID: <2024100444-unwound-poppy-97ec@gregkh>
Date: Fri, 4 Oct 2024 10:12:07 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Dipendra Khadka <kdipendra88@...il.com>
Cc: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: typec: tipd: Fix dereferencing freed memory 'fw
 in core.c

On Mon, Sep 23, 2024 at 09:26:24AM +0000, Dipendra Khadka wrote:
> Smatch reported dereferencing freed memory 'fw' in tps6598x_apply_patch().
> 
> Invoking relrease_firmware(fw) just after checking ret.
> 
> Fixes: 916b8e5fa73d ("usb: typec: tipd: add error log to provide firmware name and size")
> Signed-off-by: Dipendra Khadka <kdipendra88@...il.com>
> ---
> v2:
>  - Updated patch subject.
>  - Updated patch description.
>  - Added Fixes tag.
> v1: 
>  drivers/usb/typec/tipd/core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index ea768b19a7f1..70bf8023ea35 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -1191,12 +1191,13 @@ static int tps6598x_apply_patch(struct tps6598x *tps)
>  	dev_info(tps->dev, "Firmware update succeeded\n");
>  
>  release_fw:
> -	release_firmware(fw);
>  	if (ret) {
>  		dev_err(tps->dev, "Failed to write patch %s of %zu bytes\n",
>  			firmware_name, fw->size);
>  	}
>  
> +	relrease_firmware(fw);

Any specific reason why you did not even compile this version of the
patch?

{sigh}