[FFmpeg-devel,04/16] avformat/hlsenc: Fix leak of options when initializing muxing fails

hls_mux_init() currently leaks an AVDictionary if opening a dynamic
buffer fails or if avformat_init_output fails. This has been fixed by
moving the initialization resp. the freeing of the dictionary around:
In the former case to a place after opening the dynamic buffer, in the
latter to a place before the check for initialization failure so that it
is done unconditionally.

Furthermore, the dictionary is now only copied and freed if the options
in it are actually used (namely when in SEGMENT_TYPE_FMP4 mode).

Finally, a similar situation in hls_start() has been fixed, too.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
---
 libavformat/hlsenc.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

> 在 2019年12月16日，08:04，Andreas Rheinhardt <andreas.rheinhardt@gmail.com> 写道：
> 
> hls_mux_init() currently leaks an AVDictionary if opening a dynamic
> buffer fails or if avformat_init_output fails. This has been fixed by
> moving the initialization resp. the freeing of the dictionary around:
> In the former case to a place after opening the dynamic buffer, in the
> latter to a place before the check for initialization failure so that it
> is done unconditionally.
> 
> Furthermore, the dictionary is now only copied and freed if the options
> in it are actually used (namely when in SEGMENT_TYPE_FMP4 mode).
> 
> Finally, a similar situation in hls_start() has been fixed, too.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
> ---
> libavformat/hlsenc.c | 18 ++++++++++--------
> 1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
> index 87bbfb8086..5695af2208 100644
> --- a/libavformat/hlsenc.c
> +++ b/libavformat/hlsenc.c
> @@ -835,18 +835,19 @@ static int hls_mux_init(AVFormatContext *s, VariantStream *vs)
> 
>     vs->packets_written = 0;
>     vs->init_range_length = 0;
> -    set_http_options(s, &options, hls);
> +
>     if ((ret = avio_open_dyn_buf(&oc->pb)) < 0)
>         return ret;
> 
>     if (hls->segment_type == SEGMENT_TYPE_FMP4) {
> +        set_http_options(s, &options, hls);
>         if (byterange_mode) {
>             ret = hlsenc_io_open(s, &vs->out, vs->basename, &options);
>         } else {
>             ret = hlsenc_io_open(s, &vs->out, vs->base_output_dirname, &options);
>         }
> +        av_dict_free(&options);
>     }
> -    av_dict_free(&options);
>     if (ret < 0) {
>         av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", vs->fmp4_init_filename);
>         return ret;
> @@ -861,21 +862,23 @@ static int hls_mux_init(AVFormatContext *s, VariantStream *vs)
>         }
>     }
> 
> -    av_dict_copy(&options, hls->format_options, 0);
>     if (hls->segment_type == SEGMENT_TYPE_FMP4) {
> +        int remaining_options;
> +
> +        av_dict_copy(&options, hls->format_options, 0);
>         av_dict_set(&options, "fflags", "-autobsf", 0);
>         av_dict_set(&options, "movflags", "+frag_custom+dash+delay_moov", AV_DICT_APPEND);
>         ret = avformat_init_output(oc, &options);
> +        remaining_options = av_dict_count(options);
> +        av_dict_free(&options);
>         if (ret < 0)
>             return ret;
> -        if (av_dict_count(options)) {
> +        if (remaining_options) {
>             av_log(s, AV_LOG_ERROR, "Some of the provided format options in '%s' are not recognized\n", hls->format_options_str);
> -            av_dict_free(&options);
>             return AVERROR(EINVAL);
>         }
>     }
>     avio_flush(oc->pb);
> -    av_dict_free(&options);
>     return 0;
> }
> 
> @@ -1650,8 +1653,6 @@ static int hls_start(AVFormatContext *s, VariantStream *vs)
>     }
>     vs->number++;
> 
> -    set_http_options(s, &options, c);
> -
>     proto = avio_find_protocol_name(oc->url);
>     use_temp_file = proto && !strcmp(proto, "file") && (c->flags & HLS_TEMP_FILE);
> 
> @@ -1702,6 +1703,7 @@ static int hls_start(AVFormatContext *s, VariantStream *vs)
>             av_opt_set(oc->priv_data, "pat_period", period, 0);
>         }
>         if (c->flags & HLS_SINGLE_FILE) {
> +            set_http_options(s, &options, c);
>             if ((err = hlsenc_io_open(s, &vs->out, oc->url, &options)) < 0) {
>                 if (c->ignore_io_errors)
>                     err = 0;
> -- 
> 2.20.1
> 
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LGTM

Thanks
Steven