mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-09-29 23:32:33 +00:00
Code Issues 1 Projects Releases Wiki Activity

mxfdemux: Fix integer overflow causing out of bounds writes when handling invalid uncompressed video

Browse source 
Check ahead of time when parsing the track information whether
width, height and bpp are valid and usable without overflows.

Fixes ZDI-CAN-21660, CVE-2023-40474

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2896

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5365>
This commit is contained in:
Sebastian Dröge 2023-08-10 15:45:01 +03:00 committed by Tim-Philipp Müller
parent fddda16622
commit f73fc41f2c
1 changed files with 43 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

51
subprojects/gst-plugins-bad/gst/mxf/mxfup.c
View file

@ -134,6 +134,8 @@ mxf_up_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
gpointer mapping_data, GstBuffer ** outbuf)
{
MXFUPMappingData *data = mapping_data;
gsize expected_in_stride = 0, out_stride = 0;
gsize expected_in_size = 0, out_size = 0;
/* SMPTE 384M 7.1 */
if (key->u[12] != 0x15 || (key->u[14] != 0x01 && key->u[14] != 0x02
@ -162,22 +164,25 @@ mxf_up_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
}
}
if (gst_buffer_get_size (buffer) != data->bpp * data->width * data->height) {
// Checked for overflows when parsing the descriptor
expected_in_stride = data->bpp * data->width;
out_stride = GST_ROUND_UP_4 (expected_in_stride);
expected_in_size = expected_in_stride * data->height;
out_size = out_stride * data->height;
if (gst_buffer_get_size (buffer) != expected_in_size) {
GST_ERROR ("Invalid buffer size");
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
if (data->bpp != 4
|| GST_ROUND_UP_4 (data->width * data->bpp) != data->width * data->bpp) {
if (data->bpp != 4 || out_stride != expected_in_stride) {
guint y;
GstBuffer *ret;
GstMapInfo inmap, outmap;
guint8 *indata, *outdata;
ret =
gst_buffer_new_and_alloc (GST_ROUND_UP_4 (data->width * data->bpp) *
data->height);
ret = gst_buffer_new_and_alloc (out_size);
gst_buffer_map (buffer, &inmap, GST_MAP_READ);
gst_buffer_map (ret, &outmap, GST_MAP_WRITE);
indata = inmap.data;
@ -185,8 +190,8 @@ mxf_up_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
for (y = 0; y < data->height; y++) {
memcpy (outdata, indata, data->width * data->bpp);
outdata += GST_ROUND_UP_4 (data->width * data->bpp);
indata += data->width * data->bpp;
outdata += out_stride;
indata += expected_in_stride;
}
gst_buffer_unmap (buffer, &inmap);
@ -394,6 +399,36 @@ mxf_up_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
return NULL;
}
if (caps) {
MXFUPMappingData *data = *mapping_data;
gsize expected_in_stride = 0, out_stride = 0;
gsize expected_in_size = 0, out_size = 0;
// Do some checking of the parameters to see if they're valid and
// we can actually work with them.
if (data->image_start_offset > data->image_end_offset) {
GST_WARNING ("Invalid image start/end offset");
g_free (data);
*mapping_data = NULL;
gst_clear_caps (&caps);
return NULL;
}
if (!g_size_checked_mul (&expected_in_stride, data->bpp, data->width) ||
(out_stride = GST_ROUND_UP_4 (expected_in_stride)) < expected_in_stride
|| !g_size_checked_mul (&expected_in_size, expected_in_stride,
data->height)
|| !g_size_checked_mul (&out_size, out_stride, data->height)) {
GST_ERROR ("Invalid resolution or bit depth");
g_free (data);
*mapping_data = NULL;
gst_clear_caps (&caps);
return NULL;
}
}
return caps;
}