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rtpjpegpay: do some more sanitity checks

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Protect some more against invalid input.
This commit is contained in:
Wim Taymans 2010-09-07 16:40:08 +02:00
parent a482677a14
commit 2ed53fd77f
1 changed files with 65 additions and 44 deletions
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109
gst/rtp/gstrtpjpegpay.c
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@ -302,7 +302,6 @@ invalid_dimension:
}
}
static guint
gst_rtp_jpeg_pay_header_size (const guint8 * data, guint offset)
{
@ -310,70 +309,91 @@ gst_rtp_jpeg_pay_header_size (const guint8 * data, guint offset)
}
static guint
gst_rtp_jpeg_pay_read_quant_table (const guint8 * data, guint offset,
RtpQuantTable tables[], guint remainingBufferSize)
gst_rtp_jpeg_pay_read_quant_table (const guint8 * data, guint size,
guint offset, RtpQuantTable tables[])
{
gint quant_size, size, result;
guint quant_size, tab_size;
guint8 prec;
guint8 id;
result = quant_size = gst_rtp_jpeg_pay_header_size (data, offset);
if (offset + 2 > size)
return size;
quant_size = gst_rtp_jpeg_pay_header_size (data, offset);
if (quant_size < 2)
return size;
/* clamp to available data */
if (offset + quant_size > size)
quant_size = size - offset;
offset += 2;
quant_size -= 2;
/* Protect against rogue data by checking against remainingBufferSize */
while (quant_size > 0 && quant_size < remainingBufferSize) {
while (quant_size > 0) {
/* not enough to read the id */
if (offset + 1 > size)
break;
id = data[offset] & 0xf;
if (id == 15)
/* invalid id received - corrupt data */
break;
/* Protect against data corruption - limit to max number of quantization tables */
if (id < 15) {
prec = (data[offset] & 0xf0) >> 4;
if (prec)
size = 128;
else
size = 64;
prec = (data[offset] & 0xf0) >> 4;
if (prec)
tab_size = 128;
else
tab_size = 64;
GST_LOG ("read quant table %d, size %d, prec %02x", id, size, prec);
/* there is not enough for the table */
if (quant_size < tab_size + 1)
break;
tables[id].size = size;
tables[id].data = &data[offset + 1];
GST_LOG ("read quant table %d, tab_size %d, prec %02x", id, tab_size, prec);
size += 1;
quant_size -= size;
offset += size;
remainingBufferSize -= size;
} else {
/*invalid id received - corrupt data */
break; /* exit loop */
}
tables[id].size = tab_size;
tables[id].data = &data[offset + 1];
tab_size += 1;
quant_size -= tab_size;
offset += tab_size;
}
return result;
return offset + quant_size;
}
static gboolean
gst_rtp_jpeg_pay_read_sof (GstRtpJPEGPay * pay, const guint8 * data,
guint * offset, CompInfo info[])
guint size, guint * offset, CompInfo info[])
{
guint sof_size;
guint sof_size, off;
guint width, height, infolen;
CompInfo elem;
gint i, j;
sof_size = gst_rtp_jpeg_pay_header_size (data, *offset);
off = *offset;
/* we need at least 17 bytes for the SOF */
if (off + 17 > size)
goto wrong_length;
sof_size = gst_rtp_jpeg_pay_header_size (data, off);
if (sof_size < 17)
goto wrong_length;
*offset += sof_size;
/* skip size */
*offset += 2;
off += 2;
/* precision should be 8 */
if (data[(*offset)++] != 8)
if (data[off++] != 8)
goto bad_precision;
/* read dimensions */
height = data[*offset] << 8 | data[*offset + 1];
width = data[*offset + 2] << 8 | data[*offset + 3];
*offset += 4;
height = data[off] << 8 | data[off + 1];
width = data[off + 2] << 8 | data[off + 3];
off += 4;
GST_LOG_OBJECT (pay, "got dimensions %ux%u", height, width);
@ -386,14 +406,14 @@ gst_rtp_jpeg_pay_read_sof (GstRtpJPEGPay * pay, const guint8 * data,
pay->width = width / 8;
/* we only support 3 components */
if (data[(*offset)++] != 3)
if (data[off++] != 3)
goto bad_components;
infolen = 0;
for (i = 0; i < 3; i++) {
elem.id = data[(*offset)++];
elem.samp = data[(*offset)++];
elem.qt = data[(*offset)++];
elem.id = data[off++];
elem.samp = data[off++];
elem.qt = data[off++];
GST_LOG_OBJECT (pay, "got comp %d, samp %02x, qt %d", elem.id, elem.samp,
elem.qt);
/* insertion sort from the last element to the first */
@ -470,8 +490,9 @@ gst_rtp_jpeg_pay_scan_marker (const guint8 * data, guint size, guint * offset)
} else {
guint8 marker;
marker = data[(*offset)++];
GST_LOG ("found %02x marker", marker);
marker = data[*offset];
GST_LOG ("found %02x marker at offset %u", marker, *offset);
(*offset)++;
return marker;
}
}
@ -515,24 +536,24 @@ gst_rtp_jpeg_pay_handle_buffer (GstBaseRTPPayload * basepayload,
sos_found = FALSE;
dqt_found = FALSE;
sof_found = FALSE;
while (!sos_found && (offset < size)) {
GST_LOG_OBJECT (pay, "checking from offset %u", offset);
switch (gst_rtp_jpeg_pay_scan_marker (data, size, &offset)) {
case JPEG_MARKER_JFIF:
case JPEG_MARKER_CMT:
case JPEG_MARKER_DHT:
GST_LOG_OBJECT (pay, "skipping marker");
offset += gst_rtp_jpeg_pay_header_size (data, offset);
break;
case JPEG_MARKER_SOF:
if (!gst_rtp_jpeg_pay_read_sof (pay, data, &offset, info))
if (!gst_rtp_jpeg_pay_read_sof (pay, data, size, &offset, info))
goto invalid_format;
sof_found = TRUE;
break;
case JPEG_MARKER_DQT:
GST_LOG ("DQT found");
offset +=
gst_rtp_jpeg_pay_read_quant_table (data, offset, tables,
(size - offset));
offset = gst_rtp_jpeg_pay_read_quant_table (data, size, offset, tables);
dqt_found = TRUE;
break;
case JPEG_MARKER_SOS: