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ass: avoid infinite unref loop with bad data

Browse source 
A classic case of not updating the next item to iterate after deleting
it from the singly linked list.

Only ever hit with a text buffer with GST_CLOCK_TIME_NONE for either the
timestamp or duration.
This commit is contained in:
Matthew Waters 2019-10-07 00:05:08 +11:00
parent 5e8755cf07
commit 84718775a2
1 changed files with 10 additions and 8 deletions
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18
ext/assrender/gstassrender.c
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@ -1270,9 +1270,10 @@ wait_for_text_buf:
!GST_BUFFER_DURATION_IS_VALID (subtitle_pending->data)) {
GSList *bad = subtitle_pending;
GST_WARNING_OBJECT (render,
"Got text buffer with invalid timestamp or duration");
"Got text buffer with invalid timestamp or duration %"
GST_PTR_FORMAT, bad->data);
gst_buffer_unref (bad->data);
bad = subtitle_pending->next;
subtitle_pending = bad->next;
render->subtitle_pending =
g_slist_delete_link (render->subtitle_pending, bad);
GST_ASS_RENDER_BROADCAST (render);
@ -1297,7 +1298,8 @@ wait_for_text_buf:
/* Text too old */
if (text_running_time_end <= vid_running_time) {
GSList *old = subtitle_pending;
GST_DEBUG_OBJECT (render, "text buffer too old, popping");
GST_DEBUG_OBJECT (render,
"text buffer too old, popping %" GST_PTR_FORMAT, old->data);
gst_buffer_unref (old->data);
subtitle_pending = old->next;
render->subtitle_pending =
@ -1357,7 +1359,8 @@ wait_for_text_buf:
if (text_running_time_end <= vid_running_time_end) {
GSList *old = subtitle_pending;
GST_DEBUG_OBJECT (render, "finished text buffer, popping");
GST_DEBUG_OBJECT (render,
"finished text buffer, popping %" GST_PTR_FORMAT, old->data);
GST_ASS_RENDER_LOCK (render);
gst_buffer_unref (old->data);
subtitle_pending = old->next;
@ -1475,7 +1478,8 @@ gst_ass_render_chain_text (GstPad * pad, GstObject * parent, GstBuffer * buffer)
gboolean in_seg = FALSE;
guint64 clip_start = 0, clip_stop = 0;
GST_DEBUG_OBJECT (render, "entering chain for buffer %p", buffer);
GST_DEBUG_OBJECT (render, "entering chain for buffer %" GST_PTR_FORMAT,
buffer);
GST_ASS_RENDER_LOCK (render);
@ -1516,9 +1520,7 @@ gst_ass_render_chain_text (GstPad * pad, GstObject * parent, GstBuffer * buffer)
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
render->subtitle_segment.position = clip_start;
GST_DEBUG_OBJECT (render,
"New buffer arrived for timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
GST_DEBUG_OBJECT (render, "New buffer arrived %" GST_PTR_FORMAT, buffer);
render->subtitle_pending = g_slist_append (render->subtitle_pending,
gst_buffer_ref (buffer));
render->need_process = TRUE;