[FFmpeg-devel] [PATCH 1/2] avformat/imfdec: do not use filesize when reading XML file

[Pierre-Anthony Lemieux]

On Sat, Jan 8, 2022 at 10:49 AM Marton Balint <cus at passwd.hu> wrote:
>
>
>
> On Sat, 1 Jan 2022, Marton Balint wrote:
>
> > Signed-off-by: Marton Balint <cus at passwd.hu>
> > ---
> > libavformat/imfdec.c | 15 ++++-----------
> > 1 file changed, 4 insertions(+), 11 deletions(-)
> >
> > diff --git a/libavformat/imfdec.c b/libavformat/imfdec.c
> > index f17064cfcd..ef1e7cf206 100644
> > --- a/libavformat/imfdec.c
> > +++ b/libavformat/imfdec.c
> > @@ -73,8 +73,6 @@
> > #include <inttypes.h>
> > #include <libxml/parser.h>
> >
> > -#define MAX_BPRINT_READ_SIZE (UINT_MAX - 1)
> > -#define DEFAULT_ASSETMAP_SIZE 8 * 1024
> > #define AVRATIONAL_FORMAT "%d/%d"
> > #define AVRATIONAL_ARG(rational) rational.num, rational.den
> >
> > @@ -279,7 +277,6 @@ static int parse_assetmap(AVFormatContext *s, const char *url)
> >     const char *base_url;
> >     char *tmp_str = NULL;
> >     int ret;
> > -    int64_t filesize;
> >
> >     av_log(s, AV_LOG_DEBUG, "Asset Map URL: %s\n", url);
> >
> > @@ -289,13 +286,10 @@ static int parse_assetmap(AVFormatContext *s, const char *url)
> >     if (ret < 0)
> >         return ret;
> >
> > -    filesize = avio_size(in);
> > -    filesize = filesize > 0 ? filesize : DEFAULT_ASSETMAP_SIZE;
> > +    av_bprint_init(&buf, 0, INT_MAX); // xmlReadMemory uses integer length
> >
> > -    av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
> > -
> > -    ret = avio_read_to_bprint(in, &buf, MAX_BPRINT_READ_SIZE);
> > -    if (ret < 0 || !avio_feof(in) || buf.len == 0) {
> > +    ret = avio_read_to_bprint(in, &buf, SIZE_MAX);
> > +    if (ret < 0 || !avio_feof(in)) {
> >         av_log(s, AV_LOG_ERROR, "Unable to read to asset map '%s'\n", url);
> >         if (ret == 0)
> >             ret = AVERROR_INVALIDDATA;
> > @@ -311,8 +305,7 @@ static int parse_assetmap(AVFormatContext *s, const char *url)
> >     }
> >     base_url = av_dirname(tmp_str);
> >
> > -    filesize = buf.len;
> > -    doc = xmlReadMemory(buf.str, filesize, url, NULL, 0);
> > +    doc = xmlReadMemory(buf.str, buf.len, url, NULL, 0);
> >
> >     ret = parse_imf_asset_map_from_xml_dom(s, doc, &c->asset_locator_map, base_url);
> >     if (!ret)
>
> Will apply the series tomorrow.

It looks like the same code exists at libavformat/imf_cpl.c [1].

[1] https://github.com/FFmpeg/FFmpeg/blob/ce4d459db186a7d8ac842685cd6256c9ac1b7f25/libavformat/imf_cpl.c#L795

Does it need to be changed there as well?

>
> Regards,
> Marton
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