ksmbd: fix outstanding credits related bugs

commit 376b9133826865568167b4091ef92a68c4622b87 upstream.

outstanding credits must be initialized to 0,
because it means the sum of credits consumed by
in-flight requests.
And outstanding credits must be compared with
total credits in smb2_validate_credit_charge(),
because total credits are the sum of credits
granted by ksmbd.

This patch fix the following error,
while frametest with Windows clients:

Limits exceeding the maximum allowable outstanding requests,
given : 128, pending : 8065

Fixes: b589f5db6d4a ("ksmbd: limits exceeding the maximum allowable outstanding requests")
Cc: stable@vger.kernel.org
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Reported-by: Yufan Chen <wiz.chen@gmail.com>
Tested-by: Yufan Chen <wiz.chen@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ksmbd/connection.c b/fs/ksmbd/connection.c
index f7d5e8b..02254b0 100644 (file)
--- a/fs/ksmbd/connection.c
+++ b/fs/ksmbd/connection.c
@@ -62,7 +62,7 @@ struct ksmbd_conn *ksmbd_conn_alloc(void)
        atomic_set(&conn->req_running, 0);
        atomic_set(&conn->r_count, 0);
        conn->total_credits = 1;
-       conn->outstanding_credits = 1;
+       conn->outstanding_credits = 0;
 
        init_waitqueue_head(&conn->req_running_q);
        INIT_LIST_HEAD(&conn->conns_list);

diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c
index cc1c386..612ac15 100644 (file)
--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -339,7 +339,7 @@ static int smb2_validate_credit_charge(struct ksmbd_conn *conn,
                ret = 1;
        }
 
-       if ((u64)conn->outstanding_credits + credit_charge > conn->vals->max_credits) {
+       if ((u64)conn->outstanding_credits + credit_charge > conn->total_credits) {
                ksmbd_debug(SMB, "Limits exceeding the maximum allowable outstanding requests, given : %u, pending : %u\n",
                            credit_charge, conn->outstanding_credits);
                ret = 1;

diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c
index f2e7e3a..31da57d 100644 (file)
--- a/fs/ksmbd/smb_common.c
+++ b/fs/ksmbd/smb_common.c
@@ -140,8 +140,10 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work)
 
        hdr = work->request_buf;
        if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
-           hdr->Command == SMB_COM_NEGOTIATE)
+           hdr->Command == SMB_COM_NEGOTIATE) {
+               work->conn->outstanding_credits++;
                return 0;
+       }
 
        return -EINVAL;
 }