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cifs: handle empty list of targets in cifs_reconnect()

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commit a52930353eaf443489a350a135c5525a4acbbf56 upstream.

In case there were no cached DFS referrals in
reconn_setup_dfs_targets(), set cifs_sb to NULL prior to calling
reconn_set_next_dfs_target() so it would not try to access an empty
tgt_list.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Rishabh Bhatnagar <risbhat@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2020-07-21 09:36:41 -03:00 committed by Greg Kroah-Hartman
parent 307ffb7162
commit 2cc5d40e4d
1 changed files with 6 additions and 4 deletions
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10
fs/cifs/connect.c
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@ -513,11 +513,13 @@ cifs_reconnect(struct TCP_Server_Info *server)
sb = NULL;
} else {
cifs_sb = CIFS_SB(sb);
rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list);
if (rc && (rc != -EOPNOTSUPP)) {
cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n",
__func__);
if (rc) {
cifs_sb = NULL;
if (rc != -EOPNOTSUPP) {
cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n",
__func__);
}
} else {
server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list);
}