linux-kernel - Re: [PATCH 1/3] media: rockchip: Introduce the rkvdec2 driver

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Date: Mon, 17 Jun 2024 15:02:56 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Detlev Casanova <detlev.casanova@...labora.com>
Cc: linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Dragan Simic <dsimic@...jaro.org>,
	Alexey Charkov <alchark@...il.com>,
	Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
	Diederik de Haas <didi.debian@...ow.org>,
	Andy Yan <andy.yan@...k-chips.com>, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH 1/3] media: rockchip: Introduce the rkvdec2 driver

On Fri, Jun 14, 2024 at 09:56:27PM -0400, Detlev Casanova wrote:
> +static int rkvdec2_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct rkvdec2_ctx *ctx = vb2_get_drv_priv(q);
> +	const struct rkvdec2_coded_fmt_desc *desc;
> +	int ret, i;
> +	u32 width, height;
> +
> +	if (V4L2_TYPE_IS_CAPTURE(q->type))
> +		return 0;
> +
> +	desc = ctx->coded_fmt_desc;
> +	if (WARN_ON(!desc))
> +		return -EINVAL;
> +
> +	width = ctx->decoded_fmt.fmt.pix_mp.width;
> +	height = ctx->decoded_fmt.fmt.pix_mp.height;
> +	for (i = 0; i < RKVDEC2_RCB_COUNT; i++) {
> +		ctx->rcb_bufs[i].cpu =
> +			dma_alloc_coherent(ctx->dev->dev,
> +					   RCB_SIZE(i),
> +					   &ctx->rcb_bufs[i].dma,
> +					   GFP_KERNEL);
> +		if (!ctx->rcb_bufs[i].cpu) {
> +			ret = -ENOMEM;
> +			goto err_rcb;
> +		}
> +	}
> +
> +	if (desc->ops->start) {
> +		ret = desc->ops->start(ctx);
> +		if (ret)
> +			goto err_ops_start;
> +	}
> +
> +	return 0;
> +
> +err_ops_start:
> +err_rcb:
> +	i--;
> +	while (i) {
> +		dma_free_coherent(ctx->dev->dev,
> +				  RCB_SIZE(i),
> +				  ctx->rcb_bufs[i].cpu,
> +				  ctx->rcb_bufs[i].dma);
> +		i--;
> +	}

This will leak the first element of the ctx->rcb_bufs[i] array.  The
traditional way to write this is either while (--i >= 0) or for unsigned
int i iterators it would be while (i--).

> +
> +	return ret;
> +}

regards,
dan carpenter