From: Alexander Traud <pabstraud@compuserve.com>
Date: Fri, 13 Oct 2017 13:12:07 +0000 (+0200)
Subject: tcptls: NULL-check the parameter of ast_ssl_teardown before accessing it.
X-Git-Tag: 13.19.0-rc1~209^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=114ed320eae5f5fa111adc4ecd5ccd8f1b3537d0;p=thirdparty%2Fasterisk.git

tcptls: NULL-check the parameter of ast_ssl_teardown before accessing it.

This avoids a crash on stopping a chan_sip which failed to start its TLS server.

ASTERISK-27339 #close

Change-Id: I327fc70db68eaaca5b50a15c7fd687fde79263d5
---

diff --git a/main/tcptls.c b/main/tcptls.c
index 820a03eaf0..e8ce2ce649 100644
--- a/main/tcptls.c
+++ b/main/tcptls.c
@@ -1047,7 +1047,7 @@ int ast_ssl_setup(struct ast_tls_config *cfg)
 void ast_ssl_teardown(struct ast_tls_config *cfg)
 {
 #ifdef DO_SSL
-	if (cfg->ssl_ctx) {
+	if (cfg && cfg->ssl_ctx) {
 		SSL_CTX_free(cfg->ssl_ctx);
 		cfg->ssl_ctx = NULL;
 	}