Integer signedness error in the dissect_mount_dirpath_call function in
epan/dissectors/packet-mount.c in the Mount dissector in Wireshark
1.6.x before 1.6.14 and 1.8.x before 1.8.6, when
nfs_file_name_snooping is enabled, allows remote attackers to cause a
denial of service (application crash) via a negative length value.
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