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Created attachment 1507737 [details]
pcap with LLDP package that shows the problem.

Description of problem:
nmcli --fields all device lldp reports

NEIGHBOR[0].IEEE-802-1-VLAN-NAME:       default\376\f

when the actual name is "default". \376\f are the next two bytes in the packet (0xfe 0x0c). The pcap file is attached.

Created attachment 1507757 [details]
[PATCH] lldp: fix parsing of vlan-name attribute

(In reply to Beniamino Galvani from comment #2)
> Created attachment 1507757 [details]
> [PATCH] lldp: fix parsing of vlan-name attribute

lgtm. Could you add a "Fixes" comment?

Fixed:

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/commit/e9097787102442d1db6e1ebfbe07140bf05318a2

(and backported to all stable branches down to nm-1-2)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2302