Fix possible invalid memory access when throwing exceptions

MoarVM · Jul 27, 2019 · 64a6f69 · 64a6f69
1 parent a001b7e
commit 64a6f69
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/core/exceptions.c b/src/core/exceptions.c
@@ -599,7 +599,9 @@ MVMObject * MVM_exception_backtrace_strings(MVMThreadContext *tc, MVMObject *ex_
     else
         MVM_exception_throw_adhoc(tc, "Op 'backtracestrings' needs an exception object");
 
-    arr = MVM_repr_alloc_init(tc, tc->instance->boot_types.BOOTArray);
+    MVMROOT(tc, ex, {
+        arr = MVM_repr_alloc_init(tc, tc->instance->boot_types.BOOTArray);
+    });
     cur_frame = ex->body.origin;
 
     MVMROOT2(tc, arr, cur_frame, {