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dvdspu: Make sure enough data is allocated for the available data

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If the size read from the stream is smaller than the currently available
data then the size is bogus and the data should simply be discarded.

Fixes ZDI-CAN-20994
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2660

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4896>
This commit is contained in:
Sebastian Dröge 2023-06-13 14:23:47 +03:00 committed by GStreamer Marge Bot
parent 3144f63302
commit 7ed446dca9
1 changed files with 3 additions and 0 deletions
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subprojects/gst-plugins-bad/gst/dvdspu/gstspu-pgs.c
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@ -593,6 +593,9 @@ parse_set_object_data (GstDVDSpu * dvdspu, guint8 type, guint8 * payload,
obj->rle_data_size = GST_READ_UINT24_BE (payload); obj->rle_data_size = GST_READ_UINT24_BE (payload);
payload += 3; payload += 3;
if (end - payload > obj->rle_data_size)
return 0;
PGS_DUMP ("%d bytes of RLE data, of %d bytes total.\n", PGS_DUMP ("%d bytes of RLE data, of %d bytes total.\n",
(int) (end - payload), obj->rle_data_size); (int) (end - payload), obj->rle_data_size);