VSE: Implement sanity check for files with more channels than supported

This is a follow up to 8fecc2a8525467ee2fbbaae16ddbbc10b3050d46.

This makes sure future .blend files that have more channels than the
limit won't break Blender.

It can be backported to LTS.

This is part of https://developer.blender.org/D12645

Differential Revision: https://developer.blender.org/D12648

1 files changed, 9 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index ccd3e0bfd6c..1dd7fcf1d1a 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -63,6 +63,8 @@
 #include "BLI_threads.h"
 #include "BLI_utildefines.h"
 
+#include "BLO_readfile.h"
+
 #include "BLT_translation.h"
 
 #include "BKE_action.h"
@@ -993,8 +995,13 @@ static void link_recurs_seq(BlendDataReader *reader, ListBase *lb)
 {
   BLO_read_list(reader, lb);
 
-  LISTBASE_FOREACH (Sequence *, seq, lb) {
-    if (seq->seqbase.first) {
+  LISTBASE_FOREACH_MUTABLE (Sequence *, seq, lb) {
+    /* Sanity check. */
+    if ((seq->machine < 1) || (seq->machine > MAXSEQ)) {
+      BLI_freelinkN(lb, seq);
+      BLO_read_data_reports(reader)->count.vse_strips_skipped++;
+    }
+    else if (seq->seqbase.first) {
       link_recurs_seq(reader, &seq->seqbase);
     }
   }