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demux: check embedded cuesheet refers to only one file

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If someone was "clever" enough to embed a cuesheet
referencing multiple files, mpv would create a bunch
of nonsense chapter markers.
This commit is contained in:
Kevin Mitchell 2015-12-17 01:40:31 -08:00
parent ad80cc4eee
commit 7137afeb2c
3 changed files with 25 additions and 4 deletions
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15
demux/cue.c
View File

@ -218,3 +218,18 @@ struct cue_file *mp_parse_cue(struct bstr data)
return f;
}
int mp_check_embedded_cue(struct cue_file *f)
{
char *fn0 = f->tracks[0].filename;
for (int n = 1; n < f->num_tracks; n++) {
char *fn = f->tracks[n].filename;
// both filenames have the same address (including NULL)
if (fn0 == fn)
continue;
// only one filename is NULL, or the strings don't match
if (!fn0 || !fn || strcmp(fn0, fn) != 0)
return -1;
}
return 0;
}

1
demux/cue.h
View File

@ -38,5 +38,6 @@ struct cue_track {
bool mp_probe_cue(struct bstr data);
struct cue_file *mp_parse_cue(struct bstr data);
int mp_check_embedded_cue(struct cue_file *f);
#endif

13
demux/demux.c
View File

@ -926,10 +926,15 @@ static void demux_init_cuesheet(struct demuxer *demuxer)
if (cue && !demuxer->num_chapters) {
struct cue_file *f = mp_parse_cue(bstr0(cue));
if (f) {
for (int n = 0; n < f->num_tracks; n++) {
struct cue_track *t = &f->tracks[n];
int idx = demuxer_add_chapter(demuxer, "", t->start, -1);
mp_tags_merge(demuxer->chapters[idx].metadata, t->tags);
if (mp_check_embedded_cue(f) < 0) {
MP_WARN(demuxer, "Embedded cue sheet references more than one file. "
"Ignoring it.\n");
} else {
for (int n = 0; n < f->num_tracks; n++) {
struct cue_track *t = &f->tracks[n];
int idx = demuxer_add_chapter(demuxer, "", t->start, -1);
mp_tags_merge(demuxer->chapters[idx].metadata, t->tags);
}
}
}
talloc_free(f);