ungoogled-chromium-xdg-aur/webrtc-check-existence-of-cursor-metadata.patch

From c2cd814cdd8cbf8dda6ccec2266327a5321fbde8 Mon Sep 17 00:00:00 2001
From: Jan Grulich <grulja@gmail.com>
Date: Tue, 15 Mar 2022 14:31:55 +0100
Subject: [PATCH] PipeWire capturer: check existence of cursor metadata

Check whether there are any cursor metadata before we try to validate
and use them, otherwise we might crash on this.

Bug: webrtc:13429
Change-Id: I365da59a189b6b974cebafc94fec49d5b942efae
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/255601
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/main@{#36240}
---
 .../desktop_capture/linux/wayland/shared_screencast_stream.cc   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc b/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
index a8c86e26..9e81df4c 100644
--- a/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
+++ b/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
@@ -650,7 +650,7 @@ void SharedScreenCastStreamPrivate::ProcessBuffer(pw_buffer* buffer) {
     const struct spa_meta_cursor* cursor =
         static_cast<struct spa_meta_cursor*>(spa_buffer_find_meta_data(
             spa_buffer, SPA_META_Cursor, sizeof(*cursor)));
-    if (spa_meta_cursor_is_valid(cursor)) {
+    if (cursor && spa_meta_cursor_is_valid(cursor)) {
       struct spa_meta_bitmap* bitmap = nullptr;
 
       if (cursor->bitmap_offset)