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Fix dialplan function NULL channel safety issues
(closes issue ASTERISK-23391) Reported by: Corey Farrell Review: https://reviewboard.asterisk.org/r/3386/ ........ Merged revisions 411313 from http://svn.asterisk.org/svn/asterisk/branches/1.8 git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@411314 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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@@ -12045,7 +12045,9 @@ static int acf_vm_info(struct ast_channel *chan, const char *cmd, char *args, ch
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} else if (!strncasecmp(arg.attribute, "pager", 5)) {
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ast_copy_string(buf, vmu->pager, len);
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} else if (!strncasecmp(arg.attribute, "language", 8)) {
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ast_copy_string(buf, S_OR(vmu->language, ast_channel_language(chan)), len);
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const char *lang = S_OR(vmu->language, chan ?
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ast_channel_language(chan) : defaultlanguage);
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ast_copy_string(buf, lang, len);
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} else if (!strncasecmp(arg.attribute, "locale", 6)) {
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ast_copy_string(buf, vmu->locale, len);
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} else if (!strncasecmp(arg.attribute, "tz", 2)) {
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