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authorNamjae Jeon <namjae.jeon@samsung.com>2020-06-11 05:21:19 +0300
committerSteve French <stfrench@microsoft.com>2020-06-12 14:20:17 +0300
commitebf57440ec59a36e1fc5fe91e31d66ae0d1662d0 (patch)
tree25c2bc0e89c4b593b31439d4789aeab4886279c2
parent7866c177a03b18be3d83175014c643546e5b53c6 (diff)
downloadlinux-ebf57440ec59a36e1fc5fe91e31d66ae0d1662d0.tar.xz
smb3: add indatalen that can be a non-zero value to calculation of credit charge in smb2 ioctl
Some of tests in xfstests failed with cifsd kernel server since commit e80ddeb2f70e. 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: e80ddeb2f70e ("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>
-rw-r--r--fs/cifs/smb2pdu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index ded96b529a4d..3f232c8da390 100644
--- 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