[PATCH 2/3] cifs: fix session state check in reconnect to avoid use-after-free issue

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Don't collect exiting session in smb2_reconnect_server(), because it
will be released soon.

Note that the exiting session will stay in server->smb_ses_list until
it complete the cifs_free_ipc() and logoff() and then delete itself
from the list.

Signed-off-by: Winston Wen <wentao@xxxxxxxxxxxxx>
---
 fs/smb/client/smb2pdu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index 17fe212ab895..e04766fe6f80 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -3797,6 +3797,12 @@ void smb2_reconnect_server(struct work_struct *work)
 
 	spin_lock(&cifs_tcp_ses_lock);
 	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
+		spin_lock(&ses->ses_lock);
+		if (ses->ses_status == SES_EXITING) {
+			spin_unlock(&ses->ses_lock);
+			continue;
+		}
+		spin_unlock(&ses->ses_lock);
 
 		tcon_selected = false;
 
-- 
2.40.1




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