Fix an "invalid read during ID3v2 tag parsing".

https://security-tracker.debian.org/tracker/TEMP-0000000-57E7C1
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/876

Patch copied from upstream source repository:

https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/commit/f4a1428a6997658625d529b9db60fde812fbf1ee

From f4a1428a6997658625d529b9db60fde812fbf1ee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim-Philipp=20M=C3=BCller?= <tim@centricular.com>
Date: Wed, 3 Mar 2021 01:08:25 +0000
Subject: [PATCH] tag: id3v2: fix frame size check and potential invalid reads

Check the right variable when checking if there's
enough data left to read the frame size.

Closes https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/876

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1065>
---
 gst-libs/gst/tag/id3v2frames.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gst-libs/gst/tag/id3v2frames.c b/gst-libs/gst/tag/id3v2frames.c
index 8e9f78254..f39659bf7 100644
--- a/gst-libs/gst/tag/id3v2frames.c
+++ b/gst-libs/gst/tag/id3v2frames.c
@@ -109,7 +109,7 @@ id3v2_parse_frame (ID3TagsWorking * work)
 
   if (work->frame_flags & (ID3V2_FRAME_FORMAT_COMPRESSION |
           ID3V2_FRAME_FORMAT_DATA_LENGTH_INDICATOR)) {
-    if (work->hdr.frame_data_size <= 4)
+    if (frame_data_size <= 4)
       return FALSE;
     if (ID3V2_VER_MAJOR (work->hdr.version) == 3) {
       work->parse_size = GST_READ_UINT32_BE (frame_data);
-- 
2.31.1

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