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gstreamer1-plugins-bad-free/0001-mxfdemux-Store-GstMXFDemuxEssenceTrack-in-their-own-.patch
Wim Taymans 968399f6ee Patch CVE-2023-44446: MXF demuxer use-after-free 
Resolves: RHEL-16794
2024-01-10 12:25:26 +01:00

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From 24e891568537f4447d1c212dcb355a766296bdbb Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Tue, 12 Dec 2023 18:00:58 +0100
Subject: [PATCH] mxfdemux: Store GstMXFDemuxEssenceTrack in their own fixed
allocation
Previously they were stored inline inside a GArray, but as references to
the tracks were stored in various other places although the array could
still be updated (and reallocated!), this could lead to dangling
references in various places.
Instead now store them in a GPtrArray in their own allocation so each
track's memory position stays fixed.
Fixes ZDI-CAN-22299
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3055
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5638>
---
gst/mxf/mxfdemux.c | 114 +++++++++++++++++++++------------------------
gst/mxf/mxfdemux.h | 2 +-
2 files changed, 53 insertions(+), 63 deletions(-)
diff --git a/gst/mxf/mxfdemux.c b/gst/mxf/mxfdemux.c
index f6e5ac048..b97dce1ad 100644
--- a/gst/mxf/mxfdemux.c
+++ b/gst/mxf/mxfdemux.c
@@ -154,10 +154,25 @@ gst_mxf_demux_partition_free (GstMXFDemuxPartition * partition)
}
static void
-gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux)
+gst_mxf_demux_essence_track_free (GstMXFDemuxEssenceTrack * t)
{
- guint i;
+ if (t->offsets)
+ g_array_free (t->offsets, TRUE);
+
+ g_free (t->mapping_data);
+
+ if (t->tags)
+ gst_tag_list_unref (t->tags);
+
+ if (t->caps)
+ gst_caps_unref (t->caps);
+
+ g_free (t);
+}
+static void
+gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux)
+{
GST_DEBUG_OBJECT (demux, "Resetting MXF state");
g_list_foreach (demux->partitions, (GFunc) gst_mxf_demux_partition_free,
@@ -167,22 +182,7 @@ gst_mxf_demux_reset_mxf_state (GstMXFDemux * demux)
demux->current_partition = NULL;
- for (i = 0; i < demux->essence_tracks->len; i++) {
- GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
-
- if (t->offsets)
- g_array_free (t->offsets, TRUE);
-
- g_free (t->mapping_data);
-
- if (t->tags)
- gst_tag_list_unref (t->tags);
-
- if (t->caps)
- gst_caps_unref (t->caps);
- }
- g_array_set_size (demux->essence_tracks, 0);
+ g_ptr_array_set_size (demux->essence_tracks, 0);
}
static void
@@ -200,7 +200,7 @@ gst_mxf_demux_reset_linked_metadata (GstMXFDemux * demux)
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *track =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
track->source_package = NULL;
track->source_track = NULL;
@@ -713,8 +713,7 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux)
for (k = 0; k < demux->essence_tracks->len; k++) {
GstMXFDemuxEssenceTrack *tmp =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
- k);
+ g_ptr_array_index (demux->essence_tracks, k);
if (tmp->track_number == track->parent.track_number &&
tmp->body_sid == edata->body_sid) {
@@ -732,24 +731,23 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux)
}
if (!etrack) {
- GstMXFDemuxEssenceTrack tmp;
+ GstMXFDemuxEssenceTrack *tmp = g_new0 (GstMXFDemuxEssenceTrack, 1);
- memset (&tmp, 0, sizeof (tmp));
- tmp.body_sid = edata->body_sid;
- tmp.index_sid = edata->index_sid;
- tmp.track_number = track->parent.track_number;
- tmp.track_id = track->parent.track_id;
- memcpy (&tmp.source_package_uid, &package->parent.package_uid, 32);
+ tmp->body_sid = edata->body_sid;
+ tmp->index_sid = edata->index_sid;
+ tmp->track_number = track->parent.track_number;
+ tmp->track_id = track->parent.track_id;
+ memcpy (&tmp->source_package_uid, &package->parent.package_uid, 32);
if (demux->current_partition->partition.body_sid == edata->body_sid &&
demux->current_partition->partition.body_offset == 0)
- tmp.position = 0;
+ tmp->position = 0;
else
- tmp.position = -1;
+ tmp->position = -1;
- g_array_append_val (demux->essence_tracks, tmp);
+ g_ptr_array_add (demux->essence_tracks, tmp);
etrack =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
+ g_ptr_array_index (demux->essence_tracks,
demux->essence_tracks->len - 1);
new = TRUE;
}
@@ -876,13 +874,7 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux)
next:
if (new) {
- g_free (etrack->mapping_data);
- if (etrack->tags)
- gst_tag_list_unref (etrack->tags);
- if (etrack->caps)
- gst_caps_unref (etrack->caps);
-
- g_array_remove_index (demux->essence_tracks,
+ g_ptr_array_remove_index (demux->essence_tracks,
demux->essence_tracks->len - 1);
}
}
@@ -895,7 +887,7 @@ gst_mxf_demux_update_essence_tracks (GstMXFDemux * demux)
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (!etrack->source_package || !etrack->source_track || !etrack->caps) {
GST_ERROR_OBJECT (demux, "Failed to update essence track %u", i);
@@ -1117,7 +1109,7 @@ gst_mxf_demux_update_tracks (GstMXFDemux * demux)
for (k = 0; k < demux->essence_tracks->len; k++) {
GstMXFDemuxEssenceTrack *tmp =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, k);
+ g_ptr_array_index (demux->essence_tracks, k);
if (tmp->source_package == source_package &&
tmp->source_track == source_track) {
@@ -1598,8 +1590,7 @@ gst_mxf_demux_pad_set_component (GstMXFDemux * demux, GstMXFDemuxPad * pad,
pad->current_essence_track = NULL;
for (k = 0; k < demux->essence_tracks->len; k++) {
- GstMXFDemuxEssenceTrack *tmp =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, k);
+ GstMXFDemuxEssenceTrack *tmp = g_ptr_array_index (demux->essence_tracks, k);
if (tmp->source_package == source_package &&
tmp->source_track == source_track) {
@@ -1731,7 +1722,7 @@ gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux,
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *tmp =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (tmp->body_sid == demux->current_partition->partition.body_sid &&
(tmp->track_number == track_number || tmp->track_number == 0)) {
@@ -2656,7 +2647,7 @@ gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key,
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (etrack->body_sid != demux->current_partition->partition.body_sid)
continue;
@@ -2719,7 +2710,7 @@ gst_mxf_demux_handle_klv_packet (GstMXFDemux * demux, const MXFUL * key,
guint i;
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (etrack->body_sid != demux->current_partition->partition.body_sid)
continue;
@@ -2914,7 +2905,7 @@ from_index:
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (index_start_position != -1 && t == etrack)
t->position = index_start_position;
@@ -2937,8 +2928,7 @@ from_index:
if (ret == GST_FLOW_EOS) {
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
- i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (t->position > 0)
t->duration = t->position;
@@ -3020,7 +3010,7 @@ gst_mxf_demux_pull_and_handle_klv_packet (GstMXFDemux * demux)
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (t->position > 0)
t->duration = t->position;
@@ -3627,8 +3617,8 @@ gst_mxf_demux_seek_push (GstMXFDemux * demux, GstEvent * event)
}
for (i = 0; i < demux->essence_tracks->len; i++) {
- GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ GstMXFDemuxEssenceTrack *t = g_ptr_array_index (demux->essence_tracks, i);
+
t->position = -1;
}
@@ -4001,8 +3991,8 @@ gst_mxf_demux_seek_pull (GstMXFDemux * demux, GstEvent * event)
}
for (i = 0; i < demux->essence_tracks->len; i++) {
- GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ GstMXFDemuxEssenceTrack *t = g_ptr_array_index (demux->essence_tracks, i);
+
t->position = -1;
}
@@ -4284,7 +4274,7 @@ gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack, i);
+ g_ptr_array_index (demux->essence_tracks, i);
if (t->position > 0)
t->duration = t->position;
@@ -4325,8 +4315,8 @@ gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *etrack =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
- i);
+ g_ptr_array_index (demux->essence_tracks, i);
+
etrack->position = -1;
}
ret = TRUE;
@@ -4350,8 +4340,8 @@ gst_mxf_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
for (i = 0; i < demux->essence_tracks->len; i++) {
GstMXFDemuxEssenceTrack *t =
- &g_array_index (demux->essence_tracks, GstMXFDemuxEssenceTrack,
- i);
+ g_ptr_array_index (demux->essence_tracks, i);
+
t->position = -1;
}
demux->current_partition = NULL;
@@ -4624,7 +4614,7 @@ gst_mxf_demux_finalize (GObject * object)
g_ptr_array_free (demux->src, TRUE);
demux->src = NULL;
- g_array_free (demux->essence_tracks, TRUE);
+ g_ptr_array_free (demux->essence_tracks, TRUE);
demux->essence_tracks = NULL;
g_hash_table_destroy (demux->metadata);
@@ -4701,8 +4691,8 @@ gst_mxf_demux_init (GstMXFDemux * demux)
g_rw_lock_init (&demux->metadata_lock);
demux->src = g_ptr_array_new ();
- demux->essence_tracks =
- g_array_new (FALSE, FALSE, sizeof (GstMXFDemuxEssenceTrack));
+ demux->essence_tracks = g_ptr_array_new_with_free_func ((GDestroyNotify)
+ gst_mxf_demux_essence_track_free);
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
diff --git a/gst/mxf/mxfdemux.h b/gst/mxf/mxfdemux.h
index aac3e67d0..a452980ee 100644
--- a/gst/mxf/mxfdemux.h
+++ b/gst/mxf/mxfdemux.h
@@ -182,7 +182,7 @@ struct _GstMXFDemux
GList *partitions;
GstMXFDemuxPartition *current_partition;
- GArray *essence_tracks;
+ GPtrArray *essence_tracks;
GList *pending_index_table_segments;
GList *index_tables; /* one per BodySID / IndexSID */
--
2.43.0
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