partial fix [#23265] matrix_world rna path is visible but returns 0 to drivers without error however accessed

this report raised a number of problems with rna paths, while we still dont have multi-dimensional array access, invalid paths were being accepted which confused things.

rna path resolving code was accepting all sorts of invalid input because atoi() just returns 0 for non numeric input.
now check if 0 number == '0' character.

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_access.c b/source/blender/makesrna/intern/rna_access.c
index d8c4c67c68a..9ec21b13695 100644
--- a/source/blender/makesrna/intern/rna_access.c
+++ b/source/blender/makesrna/intern/rna_access.c
@@ -3047,6 +3047,9 @@ int RNA_path_resolve_full(PointerRNA *ptr, const char *path, PointerRNA *r_ptr,
 					else {
 						/* otherwise do int lookup */
 						intkey= atoi(token);
+						if(intkey==0 && (token[0] != '0' || token[1] != '\0')) {
+							return 0; /* we can be sure the fixedbuf was used in this case */
+						}
 						RNA_property_collection_lookup_int(&curptr, prop, intkey, &nextptr);
 					}
 
@@ -3096,6 +3099,9 @@ int RNA_path_resolve_full(PointerRNA *ptr, const char *path, PointerRNA *r_ptr,
 					else {
 						/* otherwise do int lookup */
 						*index= atoi(token);
+						if(intkey==0 && (token[0] != '0' || token[1] != '\0')) {
+							return 0; /* we can be sure the fixedbuf was used in this case */
+						}
 					}
 				}
 				else {