From 44f00e9aa18b8638b91dc6487afb564f2a7868b9 Mon Sep 17 00:00:00 2001
From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Thu, 30 Aug 2018 20:21:43 +0300
Subject: [PATCH] Improved handling of traps inside trap handlers.

---
 njs/njs_vm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/njs/njs_vm.c b/njs/njs_vm.c
index 0c68234e..7527749d 100644
--- a/njs/njs_vm.c
+++ b/njs/njs_vm.c
@@ -3280,6 +3280,12 @@ njs_vmcode_restart(njs_vm_t *vm, njs_value_t *invld1, njs_value_t *invld2)
 
     ret = vmcode->code.operation(vm, value1, &frame->trap_values[1]);
 
+    if (nxt_slow_path(ret == NJS_TRAP)) {
+        /* Trap handlers are not reentrant. */
+        njs_internal_error(vm, "trap inside restart instruction");
+        return NXT_ERROR;
+    }
+
     retval = njs_vmcode_operand(vm, vmcode->operand1);
 
     //njs_release(vm, retval);
-- 
2.47.3