linux-kernel - Re: [PATCH] dmaengine: ti: add null check of devm_kasprintf in edma_probe and udma

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Date:   Tue, 14 Mar 2023 22:01:40 +0200
From:   Péter Ujfalusi <peter.ujfalusi@...il.com>
To:     Kang Chen <void0red@...il.com>
Cc:     vkoul@...nel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: ti: add null check of devm_kasprintf in
 edma_probe and udma_probe

Hi,

On 26/02/2023 11:40, Kang Chen wrote:
> devm_kasprintf may fails, irq_name and uc->name might be null and wrong irq
> name will be used in request.

In general, I would have preferred to have separate patches for the two 
drivers to make them easier to backport if one decides.

If you decide to resend, you can add my to them:

Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>

> 
> Signed-off-by: Kang Chen <void0red@...il.com>
> ---
>   drivers/dma/ti/edma.c    | 8 ++++++++
>   drivers/dma/ti/k3-udma.c | 2 ++
>   2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/dma/ti/edma.c b/drivers/dma/ti/edma.c
> index fa06d7e6d..85cd72b64 100644
> --- a/drivers/dma/ti/edma.c
> +++ b/drivers/dma/ti/edma.c
> @@ -2413,6 +2413,10 @@ static int edma_probe(struct platform_device *pdev)
>   	if (irq >= 0) {
>   		irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
>   					  dev_name(dev));
> +		if (!irq_name) {
> +			ret = -ENOMEM;
> +			goto err_disable_pm;
> +		}
>   		ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
>   				       ecc);
>   		if (ret) {
> @@ -2429,6 +2433,10 @@ static int edma_probe(struct platform_device *pdev)
>   	if (irq >= 0) {
>   		irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
>   					  dev_name(dev));
> +		if (!irq_name) {
> +			ret = -ENOMEM;
> +			goto err_disable_pm;
> +		}
>   		ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
>   				       ecc);
>   		if (ret) {
> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index 7e23a6fde..692d1d25c 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -5494,6 +5494,8 @@ static int udma_probe(struct platform_device *pdev)
>   		uc->config.dir = DMA_MEM_TO_MEM;
>   		uc->name = devm_kasprintf(dev, GFP_KERNEL, "%s chan%d",
>   					  dev_name(dev), i);
> +		if (!uc->name)
> +			return -ENOMEM;
>   
>   		vchan_init(&uc->vc, &ud->ddev);
>   		/* Use custom vchan completion handling */

-- 
Péter