func_audiohookinheritance: Check If A Channel Was Specified

This patch prevents a crash when using the function audiohookinheritance without
setting the channel.

(closes issue ASTERISK-23104)
Reported by: Joel Vandal
Tested by: Joel Vandal
Patches:
    asterisk-23104_audiohook_inherit_no_channel-11.diff
                                     uploaded by Michael L. Young (license 5026)

Review: https://reviewboard.asterisk.org/r/3272/
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Merged revisions 409623 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 409625 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 409626 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@409627 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/funcs/func_audiohookinherit.c b/funcs/func_audiohookinherit.c
index f3a5b61892b81c18be4df7be8561744bcc2c5851..ea5c5e9ab66d2d4a67e2bd90a247338104b43d91 100644 (file)
--- a/funcs/func_audiohookinherit.c
+++ b/funcs/func_audiohookinherit.c
@@ -228,6 +228,11 @@ static int func_inheritance_write(struct ast_channel *chan, const char *function
                return -1;
        }
 
+       if (!chan) {
+               ast_log(LOG_WARNING, "No channel was provided to INHERITANCE function.\n");
+               return -1;
+       }
+
        allow = ast_true(value);
 
        /* Step 2: retrieve or set up datastore */