From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Wed, 5 Aug 2020 11:35:52 +0000 (+0300)
Subject: lib: Fix potential crash changing signal handlers after destroying ioloop
X-Git-Tag: 2.3.13~420
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9ee1a10480369863e9f23bcf75372bbaf79b8fdf;p=thirdparty%2Fdovecot%2Fcore.git

lib: Fix potential crash changing signal handlers after destroying ioloop
---

diff --git a/src/lib/lib-signals.c b/src/lib/lib-signals.c
index 1e902d4018..392317554d 100644
--- a/src/lib/lib-signals.c
+++ b/src/lib/lib-signals.c
@@ -396,8 +396,12 @@ static void lib_signals_update_expected_signals(bool expected)
 	}
 
 	sig_ioloop = signal_ioloops;
-	for (; sig_ioloop != NULL; sig_ioloop = sig_ioloop->next)
-		io_set_never_wait_alone(sig_ioloop->io, signals_expected == 0);
+	for (; sig_ioloop != NULL; sig_ioloop = sig_ioloop->next) {
+		if (sig_ioloop->io != NULL) {
+			io_set_never_wait_alone(sig_ioloop->io,
+						signals_expected == 0);
+		}
+	}
 }
 
 static void lib_signals_ioloop_switch(void)