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dvbsuboverlay: Avoid infinite loops on short data

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This commit is contained in:
Jan Schmidt 2014-04-09 00:44:08 +10:00
parent d576a7b5eb
commit 982104d764
1 changed files with 5 additions and 3 deletions
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8
gst/dvbsuboverlay/dvb-sub.c
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@ -646,7 +646,8 @@ _dvb_sub_read_2bit_string (guint8 * destbuf, gint dbuf_len,
GST_TRACE ("dbuf_len = %d", dbuf_len);
while (!stop_parsing && (gst_bit_reader_get_remaining (&gb) > 0)) {
/* Need at least 2 bits remaining */
while (!stop_parsing && (gst_bit_reader_get_remaining (&gb) > 1)) {
guint run_length = 0, clut_index = 0;
bits = gst_bit_reader_get_bits_uint32_unchecked (&gb, 2);
@ -739,7 +740,8 @@ _dvb_sub_read_4bit_string (guint8 * destbuf, gint dbuf_len,
GST_TRACE ("RUNLEN: srcbuf position %p, buf_size = %d; destination buffer "
"size is %d @ %p", *srcbuf, buf_size, dbuf_len, destbuf);
while (!stop_parsing && (gst_bit_reader_get_remaining (&gb) > 0)) {
/* Need at least 4 bits */
while (!stop_parsing && (gst_bit_reader_get_remaining (&gb) > 3)) {
guint run_length = 0, clut_index = 0;
bits = gst_bit_reader_get_bits_uint32_unchecked (&gb, 4);
@ -843,7 +845,7 @@ _dvb_sub_read_8bit_string (guint8 * destbuf, gint dbuf_len,
* FFMPEG-FIXME: lest have no chance of reading memory we don't own and visual corruption
* FFMPEG-FIXME: is guaranteed anyway when not all bytes are present */
/* Rephrased - it's better to work with bytes with default value '0' instead of reading from memory we don't own. */
while (!stop_parsing && (gst_bit_reader_get_remaining (&gb) > 0)) {
while (!stop_parsing && (gst_bit_reader_get_remaining (&gb) > 7)) {
guint run_length = 0, clut_index = 0;
bits = gst_bit_reader_get_bits_uint32_unchecked (&gb, 8);