From 5ac842b6573edbdb2bab82e07cf8110e5db46588 Mon Sep 17 00:00:00 2001
From: JianBo He <heeejianbo@gmail.com>
Date: Mon, 25 Apr 2022 21:22:17 +0800
Subject: [PATCH] fix(authn): avoid crashing emqx_authentication process due to
 un-safe call

---
 apps/emqx/src/emqx_authentication.erl | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/apps/emqx/src/emqx_authentication.erl b/apps/emqx/src/emqx_authentication.erl
index 71bf18183..92bb66dfd 100644
--- a/apps/emqx/src/emqx_authentication.erl
+++ b/apps/emqx/src/emqx_authentication.erl
@@ -417,6 +417,7 @@ list_users(ChainName, AuthenticatorID, FuzzyParams) ->
 %%--------------------------------------------------------------------
 
 init(_Opts) ->
+    process_flag(trap_exit, true),
     ok = emqx_config_handler:add_handler([?CONF_ROOT], ?MODULE),
     ok = emqx_config_handler:add_handler([listeners, '?', '?', ?CONF_ROOT], ?MODULE),
     {ok, #{hooked => false, providers => #{}}}.
@@ -784,7 +785,12 @@ update_chain(ChainName, UpdateFun) ->
         [] ->
             {error, {not_found, {chain, ChainName}}};
         [Chain] ->
-            UpdateFun(Chain)
+            try
+                UpdateFun(Chain)
+            catch
+                Class:Reason:Stk ->
+                    {error, {exception, {Class, Reason, Stk}}}
+            end
     end.
 
 call_authenticator(ChainName, AuthenticatorID, Func, Args) ->