ksmbd: avoid duplicate opinfo_put() call on error of smb21_lease_break_ack()

opinfo_put() could be called twice on error of smb21_lease_break_ack().
It will cause UAF issue if opinfo is referenced on other places.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index 45fc4bc3ac1995cb06dfae08f7e45f45c5a8b550..f3af83dc49c4030810503ec51f0e537ab8f8d555 100644 (file)
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -8219,6 +8219,11 @@ static void smb21_lease_break_ack(struct ksmbd_work *work)
                            le32_to_cpu(req->LeaseState));
        }
 
+       if (ret < 0) {
+               rsp->hdr.Status = err;
+               goto err_out;
+       }
+
        lease_state = lease->state;
        opinfo->op_state = OPLOCK_STATE_NONE;
        wake_up_interruptible_all(&opinfo->oplock_q);
@@ -8226,11 +8231,6 @@ static void smb21_lease_break_ack(struct ksmbd_work *work)
        wake_up_interruptible_all(&opinfo->oplock_brk);
        opinfo_put(opinfo);
 
-       if (ret < 0) {
-               rsp->hdr.Status = err;
-               goto err_out;
-       }
-
        rsp->StructureSize = cpu_to_le16(36);
        rsp->Reserved = 0;
        rsp->Flags = 0;