smb3: add indatalen that can be a non-zero value to calculation of credit charge...

Some of tests in xfstests failed with cifsd kernel server since commit
c48479b30c82. cifsd kernel server validates credit charge from client
by calculating it base on max((InputCount + OutputCount) and
(MaxInputResponse + MaxOutputResponse)) according to specification.

MS-SMB2 specification describe credit charge calculation of smb2 ioctl :

If Connection.SupportsMultiCredit is TRUE, the server MUST validate
CreditCharge based on the maximum of (InputCount + OutputCount) and
(MaxInputResponse + MaxOutputResponse), as specified in section 3.3.5.2.5.
If the validation fails, it MUST fail the IOCTL request with
STATUS_INVALID_PARAMETER.

This patch add indatalen that can be a non-zero value to calculation of
credit charge in SMB2_ioctl_init().

Fixes: c48479b30c82 ("smb3: fix incorrect number of credits when ioctl
MaxOutputResponse > 64K")
Cc: Stable <stable@vger.kernel.org>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Cc: Steve French <smfrench@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index ded96b529a4d852bbce91800dde34bba11fc3b53..3f232c8da39091797b4c625cd5174c5c09e3fd60 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2973,7 +2973,9 @@ SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
         * response size smaller.
         */
        req->MaxOutputResponse = cpu_to_le32(max_response_size);
-       req->sync_hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(max_response_size, SMB2_MAX_BUFFER_SIZE));
+       req->sync_hdr.CreditCharge =
+               cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
+                                        SMB2_MAX_BUFFER_SIZE));
        if (is_fsctl)
                req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
        else