4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> commit 2e5700bdde438ed708b36d8acd0398dc73cbf759 upstream. Otherwise we gradually leak credits leading to potential hung session. Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> CC: Stable <stable@xxxxxxxxxxxxxxx> Reviewed-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/smb2misc.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/fs/cifs/smb2misc.c +++ b/fs/cifs/smb2misc.c @@ -648,6 +648,13 @@ smb2_is_valid_oplock_break(char *buffer, if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK) return false; + if (rsp->sync_hdr.CreditRequest) { + spin_lock(&server->req_lock); + server->credits += le16_to_cpu(rsp->sync_hdr.CreditRequest); + spin_unlock(&server->req_lock); + wake_up(&server->request_q); + } + if (rsp->StructureSize != smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { if (le16_to_cpu(rsp->StructureSize) == 44)