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

commit e80ddeb2f7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Steve French 2020-06-03 01:33:58 -05:00 committed by Greg Kroah-Hartman
parent e1437d181d
commit 0470d6c327
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/smb2pdu.c
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@ -2747,7 +2747,7 @@ SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
* 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));
if (is_fsctl)
req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
else