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ksmbd: fix use-after-free in session logoff

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commit 2fc9feff45d92a92cd5f96487655d5be23fb7e2b upstream.

The sess->user object can currently be in use by another thread, for
example if another connection has sent a session setup request to
bind to the session being free'd. The handler for that connection could
be in the smb2_sess_setup function which makes use of sess->user.

Signed-off-by: Sean Heelan <seanheelan@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Nazar Kalashnikov <sivartiwe@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Heelan
2025-11-27 19:23:37 +03:00
committed by Greg Kroah-Hartman
parent 3a13454fd0
commit 70ad645513
1 changed files with 0 additions and 4 deletions
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4
fs/smb/server/smb2pdu.c
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@@ -2255,10 +2255,6 @@ int smb2_session_logoff(struct ksmbd_work *work)
sess->state = SMB2_SESSION_EXPIRED;
up_write(&conn->session_lock);
if (sess->user) {
ksmbd_free_user(sess->user);
sess->user = NULL;
}
ksmbd_all_conn_set_status(sess_id, KSMBD_SESS_NEED_SETUP);
rsp->StructureSize = cpu_to_le16(4);