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a50eba1e77
Customer reported a problem with mounting CIFS shares where the server hostname was 2 chars long. Turned out that the CIFS client wasn't able to resolve NetBIOS names shorter than 3 chars. Fix this by allowing a minimum of one character per hostname in dns_query(). Reproducer with samba server: # 'ab' and 'srv' hotnames resolve to same ip address $ ssh srv ln -s 'msdfs:\\ab\\share' /home/shares/dfs/link1 $ mount.cifs //srv/dfs/link1 /mnt -o ... [EINVAL] Reported-by: Pierguido Lambri <plambri@redhat.com> Signed-off-by: Paulo Alcantara <pc@manguebit.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Frank Sorenson <sorenson@redhat.com> Link: https://patch.msgid.link/20260722-net-dns_resolver-v1-1-c3385898ccf9@manguebit.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>