From e4970ee8859bef3c64d33e4268dca17bb8a97735 Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Wed, 15 Sep 2021 10:15:52 +0200
Subject: [PATCH] dnsdist: Handle exception raised in IOStateGuard's destructor

Reported by Coverity (CID 372512).
---
 pdns/dnsdistdist/tcpiohandler-mplexer.hh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pdns/dnsdistdist/tcpiohandler-mplexer.hh b/pdns/dnsdistdist/tcpiohandler-mplexer.hh
index 2fbe4b5147..d62ba7828b 100644
--- a/pdns/dnsdistdist/tcpiohandler-mplexer.hh
+++ b/pdns/dnsdistdist/tcpiohandler-mplexer.hh
@@ -187,7 +187,13 @@ public:
        and its reference count goes to zero */
     if (d_enabled && d_handler) {
       DEBUGLOG("IOStateGuard destroyed while holding a state, let's reset it");
-      d_handler->reset();
+      try {
+        d_handler->reset();
+      }
+      catch (const FDMultiplexerException& e) {
+        /* that should not happen, but an exception raised from a destructor would be bad so better
+           safe than sorry */
+      }
       d_enabled = false;
     }
   }
-- 
2.47.2