From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9683246D563 for ; Thu, 23 Jul 2026 12:23:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784809422; cv=none; b=J8C3AW+uSw6lhR+a5H5lxkhsbyUXc6aCzioN/dDBayHXval4vQkB8JX5tsUCmL+o0E7vJ7G9UlzeFAkahpS9hnyk9TMVpM1gS/k1xHY372HMWhAlB31RgR7kbu1qCDAkcUmoliO+Y+MWF4JQKS/mek9kTx4HrxHExrm9zyjJNiY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784809422; c=relaxed/simple; bh=5/b0TtXzdtqfWWfg6M0ArLBMS5/qT/WO6t/bUEpG8rY=; h=From:In-Reply-To:References:To:Cc:Subject:MIME-Version: Content-Type:Date:Message-ID; b=eJUSO+vBrSqKXtn+uM7xihhZ97atyzxtsG/lSsm7cunOauZicmUAByyAi7BiSaDcSoirFamdHxhmY2ooZR8Gym/3Tak4bvAmuezAxDT9S/z1mlpiadvCzsPr/BKyWJm6VIc6iFay7kn16J6BGHoYoz5USlawTB/AKycqdk2I7Mw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=caOJtH7B; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="caOJtH7B" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1784809420; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=h6sLo2Oh1+AR7rTMKks8nXjJcufxaJIsKON8cMnqlYQ=; b=caOJtH7BWe/amwI9aT2DqGxdwwcIo7lPD1Y5NweeTDnQmQyKpadugvP46yCnSDIbHanIao n7QUS1oFasLU5rjdIfa1zcOxmplpuqnIhstbU8qfKkgvdfIEAN9fY2+vjKGtsd6zTFMdY0 JKlKNhYMgJritlAzzMUIPMknJcxp7Ag= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-684-M7yQQaqzNBWL9i1HuCz3cQ-1; Thu, 23 Jul 2026 08:23:36 -0400 X-MC-Unique: M7yQQaqzNBWL9i1HuCz3cQ-1 X-Mimecast-MFC-AGG-ID: M7yQQaqzNBWL9i1HuCz3cQ_1784809415 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C7B721830319; Thu, 23 Jul 2026 12:23:34 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.44.33.159]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id A3BDD1800361; Thu, 23 Jul 2026 12:23:31 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20260722-net-dns_resolver-v1-1-c3385898ccf9@manguebit.org> References: <20260722-net-dns_resolver-v1-1-c3385898ccf9@manguebit.org> To: Paulo Alcantara Cc: dhowells@redhat.com, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Frank Sorenson , netdev@vger.kernel.org, linux-cifs@vger.kernel.org, Pierguido Lambri Subject: Re: [PATCH net-next] net: dns_resolver: allow shorter names in dns_query() Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <615375.1784809410.1@warthog.procyon.org.uk> Date: Thu, 23 Jul 2026 13:23:30 +0100 Message-ID: <615376.1784809410@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Paulo Alcantara wrote: > 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 > Signed-off-by: Paulo Alcantara Acked-by: David Howells