Re: [PATCH 2/7] cifs: Fix lookup of root ses in DFS referral cache

[Steve French <smfrench@gmail.com>]

merged into cifs-2.6.git for-next

On Fri, Nov 22, 2019 at 9:31 AM Paulo Alcantara (SUSE) <pc@cjr.nz> wrote:
>
> We don't care about module aliasing validation in
> cifs_compose_mount_options(..., is_smb3) when finding the root SMB
> session of an DFS namespace in order to refresh DFS referral cache.
>
> The following issue has been observed when mounting with '-t smb3' and
> then specifying 'vers=2.0':
>
> ...
> Nov 08 15:27:08 tw kernel: address conversion returned 0 for FS0.WIN.LOCAL
> Nov 08 15:27:08 tw kernel: [kworke] ==> dns_query((null),FS0.WIN.LOCAL,13,(null))
> Nov 08 15:27:08 tw kernel: [kworke] call request_key(,FS0.WIN.LOCAL,)
> Nov 08 15:27:08 tw kernel: [kworke] ==> dns_resolver_cmp(FS0.WIN.LOCAL,FS0.WIN.LOCAL)
> Nov 08 15:27:08 tw kernel: [kworke] <== dns_resolver_cmp() = 1
> Nov 08 15:27:08 tw kernel: [kworke] <== dns_query() = 13
> Nov 08 15:27:08 tw kernel: fs/cifs/dns_resolve.c: dns_resolve_server_name_to_ip: resolved: FS0.WIN.LOCAL to 192.168.30.26
> ===> Nov 08 15:27:08 tw kernel: CIFS VFS: vers=2.0 not permitted when mounting with smb3
> Nov 08 15:27:08 tw kernel: fs/cifs/dfs_cache.c: CIFS VFS: leaving refresh_tcon (xid = 26) rc = -22
> ...
>
> Fixes: 5072010ccf05 ("cifs: Fix DFS cache refresher for DFS links")
> Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
> ---
>  fs/cifs/dfs_cache.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
> index 1692c0c6c23a..2faa05860a48 100644
> --- a/fs/cifs/dfs_cache.c
> +++ b/fs/cifs/dfs_cache.c
> @@ -1317,7 +1317,6 @@ static struct cifs_ses *find_root_ses(struct dfs_cache_vol_info *vi,
>         int rc;
>         struct dfs_info3_param ref = {0};
>         char *mdata = NULL, *devname = NULL;
> -       bool is_smb3 = tcon->ses->server->vals->header_preamble_size == 0;
>         struct TCP_Server_Info *server;
>         struct cifs_ses *ses;
>         struct smb_vol vol;
> @@ -1344,7 +1343,7 @@ static struct cifs_ses *find_root_ses(struct dfs_cache_vol_info *vi,
>                 goto out;
>         }
>
> -       rc = cifs_setup_volume_info(&vol, mdata, devname, is_smb3);
> +       rc = cifs_setup_volume_info(&vol, mdata, devname, false);
>         kfree(devname);
>
>         if (rc) {
> --
> 2.24.0
>


-- 
Thanks,

Steve