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ksmbd: fix race condition from parallel smb2 logoff requests

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If parallel smb2 logoff requests come in before closing door, running
request count becomes more than 1 even though connection status is set to
KSMBD_SESS_NEED_RECONNECT. It can't get condition true, and sleep forever.
This patch fix race condition problem by returning error if connection
status was already set to KSMBD_SESS_NEED_RECONNECT.

Reported-by: luosili <rootlab@huawei.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2023-10-04 18:30:14 +09:00 committed by Steve French
parent c69813471a
commit 7ca9da7d87
1 changed files with 16 additions and 8 deletions
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24
fs/smb/server/smb2pdu.c
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@ -2164,17 +2164,17 @@ int smb2_session_logoff(struct ksmbd_work *work)
ksmbd_debug(SMB, "request\n");
sess_id = le64_to_cpu(req->hdr.SessionId);
rsp->StructureSize = cpu_to_le16(4);
err = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_logoff_rsp));
if (err) {
rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
ksmbd_conn_lock(conn);
if (!ksmbd_conn_good(conn)) {
ksmbd_conn_unlock(conn);
rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
smb2_set_err_rsp(work);
return err;
return -ENOENT;
}
sess_id = le64_to_cpu(req->hdr.SessionId);
ksmbd_all_conn_set_status(sess_id, KSMBD_SESS_NEED_RECONNECT);
ksmbd_conn_unlock(conn);
ksmbd_close_session_fds(work);
ksmbd_conn_wait_idle(conn, sess_id);
@ -2196,6 +2196,14 @@ int smb2_session_logoff(struct ksmbd_work *work)
ksmbd_free_user(sess->user);
sess->user = NULL;
ksmbd_all_conn_set_status(sess_id, KSMBD_SESS_NEED_NEGOTIATE);
rsp->StructureSize = cpu_to_le16(4);
err = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_logoff_rsp));
if (err) {
rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
smb2_set_err_rsp(work);
return err;
}
return 0;
}