cifs: fix session state check in smb2_find_smb_ses

commit 66be5c48ee1b5b8c919cc329fe6d32e16badaa40 upstream.

Chech the session state and skip it if it's exiting.

Signed-off-by: Winston Wen <wentao@uniontech.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/smb/client/smb2transport.c b/fs/smb/client/smb2transport.c
index 790acf6..22954a9 100644 (file)
--- a/fs/smb/client/smb2transport.c
+++ b/fs/smb/client/smb2transport.c
@@ -153,7 +153,14 @@ smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
        list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
                if (ses->Suid != ses_id)
                        continue;
+
+               spin_lock(&ses->ses_lock);
+               if (ses->ses_status == SES_EXITING) {
+                       spin_unlock(&ses->ses_lock);
+                       continue;
+               }
                ++ses->ses_count;
+               spin_unlock(&ses->ses_lock);
                return ses;
        }