linux-kernel - Re: [PATCH v3] uio: uio_fsl_elbc_gpcm: Add NULL check in the uio_fsl_elbc_gpcm

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Message-ID: <2025041531-trousers-saga-ecb2@gregkh>
Date: Tue, 15 Apr 2025 17:09:37 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Henry Martin <bsdhenrymartin@...il.com>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3] uio: uio_fsl_elbc_gpcm: Add NULL check in the
 uio_fsl_elbc_gpcm_probe()

On Tue, Apr 01, 2025 at 06:16:02PM +0800, Henry Martin wrote:
> devm_kasprintf() returns NULL when memory allocation fails. Currently,
> uio_fsl_elbc_gpcm_probe() does not check for this case, which results in a
> NULL pointer dereference.
> 
> Add NULL check after devm_kasprintf() to prevent this issue and ensuring
> no resources are left allocated.
> 
> Cc: stable@...r.kernel.org
> Fixes: d57801c45f53 ("uio: uio_fsl_elbc_gpcm: use device-managed allocators")
> Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
> ---
> V2 -> V3: Add Cc: stable@...r.kernel.org
> V1 -> V2: Remove printk after memory failure and add proper resource
> cleanup.
> 
>  drivers/uio/uio_fsl_elbc_gpcm.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/uio/uio_fsl_elbc_gpcm.c b/drivers/uio/uio_fsl_elbc_gpcm.c
> index 81454c3e2484..26be556d956c 100644
> --- a/drivers/uio/uio_fsl_elbc_gpcm.c
> +++ b/drivers/uio/uio_fsl_elbc_gpcm.c
> @@ -384,6 +384,10 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
>  
>  	/* set all UIO data */
>  	info->mem[0].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", node);
> +	if (!info->mem[0].name) {
> +		ret = -ENOMEM;
> +		goto out_err3;
> +	}
>  	info->mem[0].addr = res.start;
>  	info->mem[0].size = resource_size(&res);
>  	info->mem[0].memtype = UIO_MEM_PHYS;
> @@ -423,6 +427,7 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
>  out_err2:
>  	if (priv->shutdown)
>  		priv->shutdown(info, true);
> +out_err3:
>  	iounmap(info->mem[0].internal_addr);
>  	return ret;
>  }
> -- 
> 2.34.1
> 
> 

How was this tested?