From: Richard Mudgett <rmudgett@digium.com>
Date: Fri, 2 Sep 2016 16:36:38 +0000 (-0500)
Subject: format_cap.c: Fix CLI "core show channeltype Surrogate" crash.
X-Git-Tag: 13.12.0-rc1~73^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fchanges%2F86%2F3786%2F1;p=thirdparty%2Fasterisk.git

format_cap.c: Fix CLI "core show channeltype Surrogate" crash.

* Make ast_format_cap_get_names() NULL tolerant.

ASTERISK-26331 #close
Reported by: CGI.NET

Change-Id: Id67e93936dc8ec2a33a9d33655843d43b59285a3
---

diff --git a/main/format_cap.c b/main/format_cap.c
index bf3bd1c4bf..5d8a6e5852 100644
--- a/main/format_cap.c
+++ b/main/format_cap.c
@@ -737,7 +737,7 @@ const char *ast_format_cap_get_names(struct ast_format_cap *cap, struct ast_str
 
 	ast_str_set(buf, 0, "(");
 
-	if (!AST_VECTOR_SIZE(&cap->preference_order)) {
+	if (!cap || !AST_VECTOR_SIZE(&cap->preference_order)) {
 		ast_str_append(buf, 0, "nothing)");
 		return ast_str_buffer(*buf);
 	}