smb3: fix incorrect number of credits when ioctl MaxOutputResponse > 64K

We were not checking to see if ioctl requests asked for more than
64K (ie when CIFSMaxBufSize was > 64K) so when setting larger
CIFSMaxBufSize then ioctls would fail with invalid parameter errors.
When requests ask for more than 64K in MaxOutputResponse then we
need to ask for more than 1 credit.

Signed-off-by: Steve French <stfrench@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
This commit is contained in:
Steve French 2020-06-03 01:33:58 -05:00
parent 1ee0e6d47d
commit e80ddeb2f7

View File

@ -2938,7 +2938,7 @@ SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
* response size smaller. * response size smaller.
*/ */
req->MaxOutputResponse = cpu_to_le32(max_response_size); 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));
if (is_fsctl) if (is_fsctl)
req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
else else