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avformat: Redo cleanup of demuxers upon read_header() failure

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If reading the header fails, the demuxer's read_close() function (if
existing) is not called automatically; instead several demuxers call it
via "goto fail" in read_header().

This commit intends to change this by adding an internal flag for
demuxers that can be used to set on a per-AVInputFormat basis whether
read_close() should be called generically after an error during
read_header().

The flag controlling this behaviour needs to be added because it might
be unsafe to call read_close() generally (e.g. this might lead to
read_close() being called twice and this might e.g. lead to double-frees
if av_free() is used instead of av_freep(); or a size field has not
been reset after freeing the elements (see the mov demuxer for an
example of this)).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2020-03-21 17:23:52 +01:00
parent 0f6b34bfec
commit 0d81c0a10e
2 changed files with 10 additions and 1 deletions
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5
libavformat/utils.c
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@ -566,8 +566,11 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
ff_id3v2_read_dict(s->pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
if (s->iformat->read_header)
if ((ret = s->iformat->read_header(s)) < 0)
if ((ret = s->iformat->read_header(s)) < 0) {
if (s->iformat->flags_internal & FF_FMT_INIT_CLEANUP)
goto close;
goto fail;
}
if (!s->metadata) {
s->metadata = s->internal->id3v2_meta;