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wavparse: Fix clipping of size to the file size

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The size does not include the 8 bytes tag and length, so an additional 8 bytes
must be removed here. 8 bytes are always available at this point because
otherwise the parsing of the tag and length right above would've failed.

Thanks to Antonio Morales for finding and reporting the issue.

Fixes GHSL-2024-260
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3888

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8042>
This commit is contained in:
Sebastian Dröge 2024-10-04 13:27:27 +03:00 committed by GStreamer Marge Bot
parent 93d79c22a8
commit 526d0eef0d
1 changed files with 3 additions and 2 deletions
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5
subprojects/gst-plugins-good/gst/wavparse/gstwavparse.c
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@ -1338,10 +1338,11 @@ gst_wavparse_stream_headers (GstWavParse * wav)
}
/* Clip to upstream size if known */
if (upstream_size > 0 && size + wav->offset > upstream_size) {
if (upstream_size > 0 && size + 8 + wav->offset > upstream_size) {
GST_WARNING_OBJECT (wav, "Clipping chunk size to file size");
g_assert (upstream_size >= wav->offset);
size = upstream_size - wav->offset;
g_assert (upstream_size - wav->offset >= 8);
size = upstream_size - wav->offset - 8;
}
/* wav is a st00pid format, we don't know for sure where data starts.