From doc/README.dissector, it seems like passing -1 for the length should work:

    FT_STRINGZ  A NULL-terminated string of characters.
                The string length is normally the length
                given in the proto_tree_add_item() call.
                However if the length given in the call
                is -1, then the length used is that
                returned by calling tvb_strsize().

If not, does the documentation need updating?
- Chris

-----Original Message-----
From: wireshark-commits-boun...@wireshark.org 
[mailto:wireshark-commits-boun...@wireshark.org] On Behalf Of 
jma...@wireshark.org
Sent: Tuesday, July 23, 2013 9:39 AM
To: wireshark-comm...@wireshark.org
Subject: [Wireshark-commits] rev 50836: /trunk/epan/dissectors/ 
/trunk/epan/dissectors/: packet-mongo.c

http://anonsvn.wireshark.org/viewvc/viewvc.cgi?view=rev&revision=50836

User: jmayer
Date: 2013/07/23 06:38 AM

Log:
 Fix for Bug 8960 - All mongodb query show as [Malformed Packet: MONGO]
 
 proto_tree_add_item doesn't link to be called with FT_STRINGZ and length -1.

Directory: /trunk/epan/dissectors/
  Changes    Path              Action
  +1 -1      packet-mongo.c    Modified

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