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xviddec: bodge to avoid crashes

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It seems xvidcore overreads its input buffer, so a nasty workaround
is to allocate some more memory (16 bytes seem to be enough).
There is no apparent image corruption with these extra bytes set to 0,
valgrind is much happier, and the crashes go away.
It is ugly, and slower though. But then, xviddec is currently
not autoplugged for playback anyway.

https://bugzilla.gnome.org/show_bug.cgi?id=334107
This commit is contained in:
Vincent Penquerc'h 2011-01-11 10:32:47 +00:00 committed by Tim-Philipp Müller
parent f64b66ab23
commit c696b54fa7
1 changed files with 12 additions and 1 deletions
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13
ext/xvid/gstxviddec.c
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@ -310,7 +310,7 @@ gst_xviddec_chain (GstPad * pad, GstBuffer * buf)
xvid_dec_frame_t xframe;
xvid_dec_stats_t xstats;
gint ret;
guint8 *data;
guint8 *data, *dupe = NULL;
guint size;
GstFlowReturn fret;
@ -333,6 +333,16 @@ gst_xviddec_chain (GstPad * pad, GstBuffer * buf)
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
/* xvidcore overreads the input buffer, we need to alloc some extra padding
* to make things work reliably */
#define EXTRA_PADDING 16
if (EXTRA_PADDING > 0) {
dupe = g_malloc (size + EXTRA_PADDING);
memcpy (dupe, data, size);
memset (dupe + size, 0, EXTRA_PADDING);
data = dupe;
}
do { /* loop needed because xvidcore may return vol information */
/* decode and so ... */
gst_xvid_init_struct (xframe);
@ -412,6 +422,7 @@ gst_xviddec_chain (GstPad * pad, GstBuffer * buf)
}
done:
g_free (dupe);
gst_buffer_unref (buf);
return fret;