gnu: gst-plugins-base: Fix an invalid read when parsing ID3v2 tags.

* gnu/packages/patches/gst-plugins-base-fix-id3v2-invalid-read.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/gstreamer.scm (gst-plugins-base)[source]: Use it.

gnu/local.mk

@@ -1171,6 +1171,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gspell-dash-test.patch			\
   %D%/packages/patches/gst-libav-64channels-stack-corruption.patch	\
   %D%/packages/patches/gst-plugins-bad-fix-overflow.patch	\
+  %D%/packages/patches/gst-plugins-base-fix-id3v2-invalid-read.patch	\
   %D%/packages/patches/gst-plugins-good-fix-test.patch		\
   %D%/packages/patches/gst-plugins-good-CVE-2021-3497.patch	\
   %D%/packages/patches/gst-plugins-good-CVE-2021-3498.patch	\

gnu/packages/gstreamer.scm

@@ -527,6 +527,7 @@ This package provides the core library and elements.")
       (method url-fetch)
       (uri (string-append "https://gstreamer.freedesktop.org/src/" name "/"
                           name "-" version ".tar.xz"))
+      (patches (search-patches "gst-plugins-base-fix-id3v2-invalid-read.patch"))
       (sha256
        (base32
         "1b05kg46azrxxvq42c71071lfsnc34pw4vynnkczdqi6g0gzn16x"))))

gnu/packages/patches/gst-plugins-base-fix-id3v2-invalid-read.patch

@@ -0,0 +1,40 @@
+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
+