[FFmpeg-devel] [PATCH] avformat/file: fail for non-numerical arguments to pipe:

[Marton Balint]

On Mon, 29 Apr 2024, Nils Goroll wrote:

> Before this patch, the implementation of pipe: inputs/outputs would
> silently fall back to stdin/stdout for any argument not successfully
> parsed by strtol().
>
> This patch introduces an explicit error for any non-numerical arguments,
> which should avoid user confusion as in #10977.
>
> New behavior:
>
> $ cat /tmp/video.mkv | ./ffmpeg -i pipe:aa -acodec copy -vcodec copy -f 
> matroska pipe:1 | cat >/tmp/out.mkv
>
> [pipe @ 0x5618c7bcf740] Non-numerical argument "aa" to pipe:
> [in#0 @ 0x5618c7bced00] Error opening input: Invalid argument
> Error opening input file pipe:aa.
> Error opening input files: Invalid argument

OK in principle, but the patch is a bit overcomplicated and is mixing 
cosmetic and functional changes. See a simplifed version attached, will 
apply that in a few days.

Thanks,
Marton

>
> Signed-off-by: Nils Goroll <nils.goroll at uplex.de>
> ---
>  libavformat/file.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/libavformat/file.c b/libavformat/file.c
> index 0b7452bc20..317a769e32 100644
> --- a/libavformat/file.c
> +++ b/libavformat/file.c
> @@ -437,18 +437,21 @@ static int pipe_open(URLContext *h, const char 
> *filename, int flags)
>  {
>      FileContext *c = h->priv_data;
>      int fd;
> -    char *final;
> +    char *final = NULL;
>       if (c->fd < 0) {
>          av_strstart(filename, "pipe:", &filename);
> -        fd = strtol(filename, &final, 10);
> -        if((filename == final) || *final ) {/* No digits found, or something 
> like 10ab */
> -            if (flags & AVIO_FLAG_WRITE) {
> -                fd = 1;
> -            } else {
> -                fd = 0;
> -            }
> +        if (*filename == '\0')
> +                fd = (flags & AVIO_FLAG_WRITE) ? 1 : 0;
> +        else
> +                fd = strtol(filename, &final, 10);
> +
> +        if (final != NULL && *final != '\0') {
> +                av_log(h, AV_LOG_ERROR,
> +                    "Non-numerical argument \"%s\" to pipe:\n",
> +		    filename);
> +                return AVERROR(EINVAL);
>          }
>          c->fd = fd;
>     }
> -- 
> 2.39.2
>
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