From c7f995f1030efb3281faa72a1a8827969f3591bc Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Mon, 16 Dec 2024 11:48:03 +0100
Subject: [PATCH 6/9] matroskademux: Only unmap GstMapInfo in WavPack header
 extraction error paths if previously mapped

Thanks to Antonio Morales for finding and reporting the issue.

Fixes GHSL-2024-197
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3863

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8057>
---
 gst/matroska/matroska-demux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index f890ae611..2db68bc1f 100644
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -3687,7 +3687,6 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
   GstMatroskaTrackAudioContext *audiocontext =
       (GstMatroskaTrackAudioContext *) stream;
   GstBuffer *newbuf = NULL;
-  GstMapInfo map, outmap;
   guint8 *buf_data, *data;
   Wavpack4Header wvh;
 
@@ -3704,11 +3703,11 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
 
   if (audiocontext->channels <= 2) {
     guint32 block_samples, tmp;
+    GstMapInfo outmap;
     gsize size = gst_buffer_get_size (*buf);
 
     if (size < 4) {
       GST_ERROR_OBJECT (element, "Too small wavpack buffer");
-      gst_buffer_unmap (*buf, &map);
       return GST_FLOW_ERROR;
     }
 
@@ -3746,6 +3745,7 @@ gst_matroska_demux_add_wvpk_header (GstElement * element,
     *buf = newbuf;
     audiocontext->wvpk_block_index += block_samples;
   } else {
+    GstMapInfo map, outmap;
     guint8 *outdata = NULL;
     gsize buf_size, size;
     guint32 block_samples, flags, crc, blocksize;
-- 
2.47.0