Initialize file descriptors for dummy channels to -1.

Dummy channels usually aren't read from, but functions like SHELL and CURL
use autoservice on the channel.

(closes issue ASTERISK-20283)
Reported by: Gareth Palmer
Patches:
      svn-371580.patch (license #5169) patch uploaded by Gareth Palmer (modified)
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Merged revisions 371888 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 371890 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 371891 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@371892 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/channel.c b/main/channel.c
index bccba2e14948b2ba643f539b16a5d6a666dac3b5..32ce57ec5d29ed74fe2d5110c4e54302e1689ade 100644 (file)
--- a/main/channel.c
+++ b/main/channel.c
@@ -1208,6 +1208,18 @@ struct ast_channel *ast_dummy_channel_alloc(void)
        ast_pbx_hangup_handler_init(tmp);
        AST_LIST_HEAD_INIT_NOLOCK(ast_channel_datastores(tmp));
 
+       /*
+        * Init file descriptors to unopened state just in case
+        * autoservice is called on the channel or something tries to
+        * read a frame from it.
+        */
+       ast_channel_timingfd_set(tmp, -1);
+       ast_channel_internal_alertpipe_clear(tmp);
+       ast_channel_internal_fd_clear_all(tmp);
+#ifdef HAVE_EPOLL
+       ast_channel_epfd(tmp) = -1;
+#endif
+
        headp = ast_channel_varshead(tmp);
        AST_LIST_HEAD_INIT_NOLOCK(headp);