linux-kernel - Re: [PATCH] media: v4l2-jpeg: ignore the unknown APP14 marker

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Message-ID: <95b67bc9-75ca-1675-7add-dde3c41fb084@oss.nxp.com>
Date:   Sat, 18 Feb 2023 23:51:13 +0200
From:   "mirela.rabulea@....nxp.com" <mirela.rabulea@....nxp.com>
To:     Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, xiahong.bao@....com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: v4l2-jpeg: ignore the unknown APP14 marker


On 16.12.2022 11:08, Ming Qian wrote:
> The legal identifier of APP14 is "Adobe\0",
> but sometimes it may be
> "This is an unknown APP marker . Compliant decoders must ignore it."
> In this case, just ignore it.
> It won't affect the decode result.
> 
> Fixes: b8035f7988a8 ("media: Add parsing for APP14 data segment in jpeg helpers")
> Signed-off-by: Ming Qian <ming.qian@....com>

Thanks,
Reviewed-by: Mirela Rabulea <mirela.rabulea@....com>

> ---
>   drivers/media/v4l2-core/v4l2-jpeg.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-jpeg.c b/drivers/media/v4l2-core/v4l2-jpeg.c
> index 75c2af763d55..94435a7b6816 100644
> --- a/drivers/media/v4l2-core/v4l2-jpeg.c
> +++ b/drivers/media/v4l2-core/v4l2-jpeg.c
> @@ -460,7 +460,7 @@ static int jpeg_parse_app14_data(struct jpeg_stream *stream,
>   	/* Check for "Adobe\0" in Ap1..6 */
>   	if (stream->curr + 6 > stream->end ||
>   	    strncmp(stream->curr, "Adobe\0", 6))
> -		return -EINVAL;
> +		return jpeg_skip(stream, lp - 2);
>   
>   	/* get to Ap12 */
>   	ret = jpeg_skip(stream, 11);