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cifs: use DFS root session instead of tcon ses 

commit 6284e46bdd upstream.

Use DFS root session whenever possible to get new DFS referrals
otherwise we might end up with an IPC tcon (tcon->ses->tcon_ipc) that
doesn't respond to them.  It should be safe accessing
@ses->dfs_root_ses directly in cifs_inval_name_dfs_link_error() as it
has same lifetime as of @tcon.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Cc: stable@vger.kernel.org # 6.2
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2023-03-14 20:32:56 -03:00 committed by Greg Kroah-Hartman
parent dd83d228ef
commit ea4804fb5f
1 changed files with 1 additions and 0 deletions
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fs/cifs/misc.c
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@ -1364,6 +1364,7 @@ int cifs_inval_name_dfs_link_error(const unsigned int xid,
* removing cached DFS targets that the client would eventually
* need during failover.
*/
ses = CIFS_DFS_ROOT_SES(ses);
if (ses->server->ops->get_dfs_refer &&
!ses->server->ops->get_dfs_refer(xid, ses, ref_path, &refs,
&num_refs, cifs_sb->local_nls,