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)
........

Merged revisions 371888 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@371890 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/channel.c b/main/channel.c
index c19af9644a23b7883bd1c7fb5807afbde58b8f6d..a2d586c9eec0cd61d459b87f801e8101e8913629 100644 (file)
--- a/main/channel.c
+++ b/main/channel.c
@@ -1400,6 +1400,7 @@ struct ast_channel *ast_dummy_channel_alloc(void)
 {
        struct ast_channel *tmp;
        struct varshead *headp;
+       int x;
 
 #if defined(REF_DEBUG)
        tmp = __ao2_alloc_debug(sizeof(*tmp), ast_dummy_channel_destructor, "dummy channel",
@@ -1419,6 +1420,22 @@ struct ast_channel *ast_dummy_channel_alloc(void)
                return ast_channel_unref(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.
+        */
+       tmp->timingfd = -1;
+       for (x = 0; x < ARRAY_LEN(tmp->alertpipe); ++x) {
+               tmp->alertpipe[x] = -1;
+       }
+       for (x = 0; x < ARRAY_LEN(tmp->fds); ++x) {
+               tmp->fds[x] = -1;
+       }
+#ifdef HAVE_EPOLL
+       tmp->epfd = -1;
+#endif
+
        headp = &tmp->varshead;
        AST_LIST_HEAD_INIT_NOLOCK(headp);