diff options
| author | Namjae Jeon <linkinjeon@kernel.org> | 2023-05-03 02:51:12 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2023-05-04 07:03:02 +0300 |
| commit | 30210947a343b6b3ca13adc9bfc88e1543e16dd5 (patch) | |
| tree | b975ba955a52288885c013b107e7114523c3c24b /fs/ksmbd/smb2pdu.c | |
| parent | abcc506a9a71976a8b4c9bf3ee6efd13229c1e19 (diff) | |
| download | linux-30210947a343b6b3ca13adc9bfc88e1543e16dd5.tar.xz | |
ksmbd: fix racy issue under cocurrent smb2 tree disconnect
There is UAF issue under cocurrent smb2 tree disconnect.
This patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent
access.
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-20592
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd/smb2pdu.c')
| -rw-r--r-- | fs/ksmbd/smb2pdu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index 0ca1c5daf60a..cb93fd231f4e 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -2053,11 +2053,12 @@ int smb2_tree_disconnect(struct ksmbd_work *work) ksmbd_debug(SMB, "request\n"); - if (!tcon) { + if (!tcon || test_and_set_bit(TREE_CONN_EXPIRE, &tcon->status)) { struct smb2_tree_disconnect_req *req = smb2_get_msg(work->request_buf); ksmbd_debug(SMB, "Invalid tid %d\n", req->hdr.Id.SyncId.TreeId); + rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED; smb2_set_err_rsp(work); return 0; |