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qtdemux: Fix zlib inflate loop

Browse source 
Handle errors cleanly, deallocate all memory and return the actual size
of the inflated data.

https://bugzilla.gnome.org/show_bug.cgi?id=775455
This commit is contained in:
Sebastian Dröge 2016-12-01 14:27:55 +02:00
parent 87a2c140ca
commit 5e4883094b
1 changed files with 46 additions and 39 deletions
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85
gst/isomp4/qtdemux.c
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@ -6865,50 +6865,55 @@ qtdemux_sink_activate_mode (GstPad * sinkpad, GstObject * parent,
#ifdef HAVE_ZLIB
static void *
qtdemux_zalloc (void *opaque, unsigned int items, unsigned int size)
{
return g_malloc (items * size);
}
static void
qtdemux_zfree (void *opaque, void *addr)
{
g_free (addr);
}
static void *
qtdemux_inflate (void *z_buffer, guint z_length, guint length)
qtdemux_inflate (void *z_buffer, guint z_length, guint * length)
{
guint8 *buffer;
z_stream *z;
z_stream z;
int ret;
z = g_new0 (z_stream, 1);
z->zalloc = qtdemux_zalloc;
z->zfree = qtdemux_zfree;
z->opaque = NULL;
memset (&z, 0, sizeof (z));
z.zalloc = NULL;
z.zfree = NULL;
z.opaque = NULL;
z->next_in = z_buffer;
z->avail_in = z_length;
if ((ret = inflateInit (&z)) != Z_OK) {
GST_ERROR ("inflateInit() returned %d", ret);
return NULL;
}
buffer = (guint8 *) g_malloc (length);
ret = inflateInit (z);
while (z->avail_in > 0) {
if (z->avail_out == 0) {
length += 1024;
buffer = (guint8 *) g_realloc (buffer, length);
z->next_out = buffer + z->total_out;
z->avail_out = 1024;
}
ret = inflate (z, Z_SYNC_FLUSH);
if (ret != Z_OK)
z.next_in = z_buffer;
z.avail_in = z_length;
buffer = (guint8 *) g_malloc (*length);
z.avail_out = *length;
z.next_out = (Bytef *) buffer;
do {
ret = inflate (&z, Z_NO_FLUSH);
if (ret == Z_STREAM_END) {
break;
}
} else if (ret != Z_OK) {
GST_WARNING ("inflate() returned %d", ret);
break;
}
if (z.avail_out == 0) {
*length += 1024;
buffer = (guint8 *) g_realloc (buffer, *length);
z.next_out = (Bytef *) (buffer + z.total_out);
z.avail_out = 1024;
}
} while (z.avail_in > 0);
if (ret != Z_STREAM_END) {
g_warning ("inflate() returned %d", ret);
g_free (buffer);
buffer = NULL;
*length = 0;
} else {
*length = z.total_out;
}
g_free (z);
inflateEnd (&z);
return buffer;
}
#endif /* HAVE_ZLIB */
@ -6951,13 +6956,15 @@ qtdemux_parse_moov (GstQTDemux * qtdemux, const guint8 * buffer, guint length)
buf =
(guint8 *) qtdemux_inflate ((guint8 *) cmvd->data + 12,
compressed_length, uncompressed_length);
compressed_length, &uncompressed_length);
qtdemux->moov_node_compressed = qtdemux->moov_node;
qtdemux->moov_node = g_node_new (buf);
if (buf) {
qtdemux->moov_node_compressed = qtdemux->moov_node;
qtdemux->moov_node = g_node_new (buf);
qtdemux_parse_node (qtdemux, qtdemux->moov_node, buf,
uncompressed_length);
qtdemux_parse_node (qtdemux, qtdemux->moov_node, buf,
uncompressed_length);
}
break;
}
#endif /* HAVE_ZLIB */