[PATCH 5.9 25/75] cifs: add NULL check for ses->tcon_ipc

[Greg Kroah-Hartman]

From: Aurelien Aptel <aap...@suse.com>

commit 59463eb88829f646aed13283fd84d02a475334fe upstream.

In some scenarios (DFS and BAD_NETWORK_NAME) set_root_set() can be
called with a NULL ses->tcon_ipc.

Signed-off-by: Aurelien Aptel <aap...@suse.com>
Reviewed-by: Paulo Alcantara (SUSE) <p...@cjr.nz>
CC: Stable <sta...@vger.kernel.org>
Signed-off-by: Steve French <stfre...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/cifs/connect.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4768,7 +4768,8 @@ static void set_root_ses(struct cifs_sb_
        if (ses) {
                spin_lock(&cifs_tcp_ses_lock);
                ses->ses_count++;
-               ses->tcon_ipc->remap = cifs_remap(cifs_sb);
+               if (ses->tcon_ipc)
+                       ses->tcon_ipc->remap = cifs_remap(cifs_sb);
                spin_unlock(&cifs_tcp_ses_lock);
        }
        *root_ses = ses;