linux-kernel - Re: [PATCH -next] media: rkvdec: Fix memset size error

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Date:   Mon, 20 Jun 2022 10:52:53 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Zhang Zekun <zhangzekun11@...wei.com>
Cc:     ezequiel@...guardiasur.com.ar, mchehab@...nel.org,
        gregkh@...uxfoundation.org, andrzej.p@...labora.com,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] media: rkvdec: Fix memset size error

On Fri, Jun 17, 2022 at 07:31:01AM +0000, Zhang Zekun wrote:
> 'dma_alloc_coherent()' alloc a 'RKVDEC_VP9_COUNT_SIZE' size area to
> 'unsigned char *count_tbl', however, the memset() bellow only set
> 'sizeof(*count_tbl)', which equals to 1, bytes to zero. This can
>  cause unexpected error.
> 
> Fixes: f25709c4ff15 ("media: rkvdec: Add the VP9 backend")
> Signed-off-by: Zhang Zekun <zhangzekun11@...wei.com>
> ---
>  drivers/staging/media/rkvdec/rkvdec-vp9.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec-vp9.c b/drivers/staging/media/rkvdec/rkvdec-vp9.c
> index 311a12656072..3ad303a3de48 100644
> --- a/drivers/staging/media/rkvdec/rkvdec-vp9.c
> +++ b/drivers/staging/media/rkvdec/rkvdec-vp9.c
> @@ -1026,7 +1026,7 @@ static int rkvdec_vp9_start(struct rkvdec_ctx *ctx)
>  
>  	vp9_ctx->count_tbl.size = RKVDEC_VP9_COUNT_SIZE;
>  	vp9_ctx->count_tbl.cpu = count_tbl;
> -	memset(count_tbl, 0, sizeof(*count_tbl));
> +	memset(count_tbl, 0, RKVDEC_VP9_COUNT_SIZE);

Just delete the memset instead like Robin said.  No Fixes tag required
on this one.

regards,
dan carpenter