Re: [FFmpeg-devel] [PATCH 1/9] avformat/evcdec: ensure there are enough bytes to seekback

From: James Almer <jamrial@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH 1/9] avformat/evcdec: ensure there are enough bytes to seekback
Date: Wed, 21 Jun 2023 13:31:51 -0300
Message-ID: <606a89ea-348d-c0af-b7b3-bdd0b16dfc73@gmail.com> (raw)
In-Reply-To: <20230620144042.9629-1-jamrial@gmail.com>

On 6/20/2023 11:40 AM, James Almer wrote:
> Signed-off-by: James Almer <jamrial@gmail.com>
> ---
>   libavformat/evcdec.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/libavformat/evcdec.c b/libavformat/evcdec.c
> index 890babd3cb..9c4969e78f 100644
> --- a/libavformat/evcdec.c
> +++ b/libavformat/evcdec.c
> @@ -30,6 +30,7 @@
>   
>   #include "rawdec.h"
>   #include "avformat.h"
> +#include "avio_internal.h"
>   #include "internal.h"
>   
>   
> @@ -192,8 +193,12 @@ static int evc_read_packet(AVFormatContext *s, AVPacket *pkt)
>       }
>   
>       while(!au_end_found) {
> -
>           uint8_t buf[EVC_NALU_LENGTH_PREFIX_SIZE];
> +
> +        ret = ffio_ensure_seekback(s->pb, EVC_NALU_LENGTH_PREFIX_SIZE);
> +        if (ret < 0)
> +            return ret;
> +
>           ret = avio_read(s->pb, (unsigned char *)&buf, EVC_NALU_LENGTH_PREFIX_SIZE);
>           if (ret < 0) {
>               av_packet_unref(pkt);

Will apply set.
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