runtime: scriptblock: fix use of uninitialised memory

bshell.core/CMakeLists.txt

@@ -11,7 +11,6 @@ foreach (d ${source_dirs})
 	set(sources ${sources} ${d_sources})
 endforeach (d)
 
-message(STATUS ${sources})
 add_library(bshell.core SHARED ${sources})
 
 target_link_libraries(bshell.core bshell.runtime FX::Runtime FX::Collections FX::Term)

bshell.runtime/CMakeLists.txt

@@ -13,7 +13,6 @@ foreach (d ${source_dirs})
 	set(sources ${sources} ${d_sources})
 endforeach (d)
 
-message(STATUS ${sources})
 add_library(bshell.runtime SHARED ${sources})
 
 target_link_libraries(bshell.runtime FX::Runtime FX::Collections FX::Term)

bshell.runtime/runtime/scope.c

@@ -90,10 +90,25 @@ void bshell_runtime_scope_set_block(
 		bshell_scriptblock_unref(scope->s_block);
 	}
 
+	if (!block) {
+		scope->s_block = NULL;
+		scope->s_ip = 0;
+		scope->s_instr = NULL;
+		scope->s_nr_instr = 0;
+		scope->s_pool = NULL;
+		scope->s_nr_pool = 0;
+	} else {
 		scope->s_block = bshell_scriptblock_ref(block);
 		scope->s_ip = 0;
-	bshell_scriptblock_get_text(block, &scope->s_instr, &scope->s_nr_instr);
-	bshell_scriptblock_get_pool(block, &scope->s_pool, &scope->s_nr_pool);
+		bshell_scriptblock_get_text(
+			block,
+			&scope->s_instr,
+			&scope->s_nr_instr);
+		bshell_scriptblock_get_pool(
+			block,
+			&scope->s_pool,
+			&scope->s_nr_pool);
+	}
 }
 
 fx_hashtable *bshell_runtime_scope_get_functions(

bshell.runtime/script-block.c

@@ -169,6 +169,8 @@ static unsigned long scriptblock_get_string(
 		goto cleanup;
 	}
 
+	memset(cache_entry, 0x0, sizeof *cache_entry);
+
 	str = fx_string_create_from_cstr(s);
 	if (!str) {
 		goto cleanup;