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qtdemux: Check if we have enough data available when parsing edit lists

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Also consume the data entry by entry to get complicated indexing out of
the code.

https://bugzilla.gnome.org/show_bug.cgi?id=776107
This commit is contained in:
Sebastian Dröge 2016-12-14 21:45:15 +02:00
parent 6ec3cc70b2
commit 76c007dd25
1 changed files with 21 additions and 7 deletions
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28
gst/isomp4/qtdemux.c
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@ -8685,8 +8685,9 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
gint i, count, entry_size;
guint64 time;
GstClockTime stime;
guint8 *buffer;
const guint8 *buffer;
guint8 version;
guint32 size;
GST_DEBUG_OBJECT (qtdemux, "looking for edit list");
if (!(elst = qtdemux_tree_get_child_by_type (edts, FOURCC_elst)))
@ -8694,11 +8695,22 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
buffer = elst->data;
size = QT_UINT32 (buffer);
/* version, flags, n_segments */
if (size < 16) {
GST_WARNING_OBJECT (qtdemux, "Invalid edit list");
goto done;
}
version = QT_UINT8 (buffer + 8);
entry_size = (version == 1) ? 20 : 12;
n_segments = QT_UINT32 (buffer + 12);
if (size < 16 + n_segments * entry_size) {
GST_WARNING_OBJECT (qtdemux, "Invalid edit list");
goto done;
}
/* we might allocate a bit too much, at least allocate 1 segment */
stream->segments = g_new (QtDemuxSegment, MAX (n_segments, 1));
@ -8706,6 +8718,7 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
time = 0;
stime = 0;
count = 0;
buffer += 16;
for (i = 0; i < n_segments; i++) {
guint64 duration;
guint64 media_time;
@ -8715,13 +8728,13 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
GstClockTime media_start = GST_CLOCK_TIME_NONE;
if (version == 1) {
media_time = QT_UINT64 (buffer + 24 + i * entry_size);
duration = QT_UINT64 (buffer + 16 + i * entry_size);
media_time = QT_UINT64 (buffer + 8);
duration = QT_UINT64 (buffer);
if (media_time == G_MAXUINT64)
time_valid = FALSE;
} else {
media_time = QT_UINT32 (buffer + 20 + i * entry_size);
duration = QT_UINT32 (buffer + 16 + i * entry_size);
media_time = QT_UINT32 (buffer + 4);
duration = QT_UINT32 (buffer);
if (media_time == G_MAXUINT32)
time_valid = FALSE;
}
@ -8761,8 +8774,7 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
segment->media_start = GST_CLOCK_TIME_NONE;
segment->media_stop = GST_CLOCK_TIME_NONE;
}
rate_int =
QT_UINT32 (buffer + ((version == 1) ? 32 : 24) + i * entry_size);
rate_int = QT_UINT32 (buffer + ((version == 1) ? 16 : 8));
if (rate_int <= 1) {
/* 0 is not allowed, some programs write 1 instead of the floating point
@ -8792,6 +8804,8 @@ qtdemux_parse_segments (GstQTDemux * qtdemux, QtDemuxStream * stream,
GST_TIME_ARGS (qtdemux->segment.stop));
qtdemux->segment.stop = segment->stop_time;
}
buffer += entry_size;
}
GST_DEBUG_OBJECT (qtdemux, "found %d segments", count);
stream->n_segments = count;