2018-03-30 17:45 GMT-07:00 Ronnie Sahlberg <lsahlber@xxxxxxxxxx>:
> This variable is set to 4 for all protocol versions and replaces
> the hardcoded constant 4 throughought the code.
> This will later be updated to reflect whether a response packet
> has a 4 byte length preamble or not once we start removing this
> field from the SMB2+ dialects.
>
> Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
> ---
> fs/cifs/cifsglob.h | 1 +
> fs/cifs/cifssmb.c | 6 ++++--
> fs/cifs/connect.c | 16 ++++++++++-----
> fs/cifs/smb1ops.c | 1 +
> fs/cifs/smb2misc.c | 19 +++++++++--------
> fs/cifs/smb2ops.c | 59 +++++++++++++++++++++++++++++++++--------------------
> fs/cifs/smb2pdu.c | 15 ++++++++------
> fs/cifs/transport.c | 3 ++-
> 8 files changed, 75 insertions(+), 45 deletions(-)
>
> diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> index c294093f04d5..3e3f86841372 100644
> --- a/fs/cifs/cifsglob.h
> +++ b/fs/cifs/cifsglob.h
> @@ -468,6 +468,7 @@ struct smb_version_values {
> __u32 exclusive_lock_type;
> __u32 shared_lock_type;
> __u32 unlock_lock_type;
> + size_t header_preamble_size;
> size_t header_size;
> size_t max_header_size;
> size_t read_rsp_size;
> diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
> index 9ceebf30eb22..59c09a596c0a 100644
> --- a/fs/cifs/cifssmb.c
> +++ b/fs/cifs/cifssmb.c
> @@ -1454,7 +1454,8 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
> unsigned int data_offset, data_len;
> struct cifs_readdata *rdata = mid->callback_data;
> char *buf = server->smallbuf;
> - unsigned int buflen = get_rfc1002_length(buf) + 4;
> + unsigned int buflen = get_rfc1002_length(buf) +
> + server->vals->header_preamble_size;
> bool use_rdma_mr = false;
>
> cifs_dbg(FYI, "%s: mid=%llu offset=%llu bytes=%u\n",
> @@ -1504,7 +1505,8 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
> return cifs_readv_discard(server, mid);
> }
>
> - data_offset = server->ops->read_data_offset(buf) + 4;
> + data_offset = server->ops->read_data_offset(buf) +
> + server->vals->header_preamble_size;
> if (data_offset < server->total_read) {
> /*
> * win2k8 sometimes sends an offset of 0 when the read
> diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
> index a726f524fb84..1f2e3b15b2b1 100644
> --- a/fs/cifs/connect.c
> +++ b/fs/cifs/connect.c
> @@ -775,7 +775,8 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
> unsigned int pdu_length = get_rfc1002_length(buf);
>
> /* make sure this will fit in a large buffer */
> - if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
> + if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
> + server->vals->header_preamble_size) {
> cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
> cifs_reconnect(server);
> wake_up(&server->response_q);
> @@ -791,7 +792,9 @@ standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
>
> /* now read the rest */
> length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
> - pdu_length - HEADER_SIZE(server) + 1 + 4);
> + pdu_length - HEADER_SIZE(server) + 1
> + + server->vals->header_preamble_size);
> +
> if (length < 0)
> return length;
> server->total_read += length;
> @@ -884,7 +887,8 @@ cifs_demultiplex_thread(void *p)
> continue;
>
> /* make sure we have enough to get to the MID */
> - if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
> + if (pdu_length < HEADER_SIZE(server) - 1 -
> + server->vals->header_preamble_size) {
> cifs_dbg(VFS, "SMB response too short (%u bytes)\n",
> pdu_length);
> cifs_reconnect(server);
> @@ -893,8 +897,10 @@ cifs_demultiplex_thread(void *p)
> }
>
> /* read down to the MID */
> - length = cifs_read_from_socket(server, buf + 4,
> - HEADER_SIZE(server) - 1 - 4);
> + length = cifs_read_from_socket(server,
> + buf + server->vals->header_preamble_size,
> + HEADER_SIZE(server) - 1
> + - server->vals->header_preamble_size);
> if (length < 0)
> continue;
> server->total_read += length;
> diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
> index 3d495e440c87..aff8ce8ba34d 100644
> --- a/fs/cifs/smb1ops.c
> +++ b/fs/cifs/smb1ops.c
> @@ -1122,6 +1122,7 @@ struct smb_version_values smb1_values = {
> .exclusive_lock_type = 0,
> .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
> .unlock_lock_type = 0,
> + .header_preamble_size = 4,
> .header_size = sizeof(struct smb_hdr),
> .max_header_size = MAX_CIFS_HDR_SIZE,
> .read_rsp_size = sizeof(READ_RSP),
> diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
> index da012c3ab700..dfa5d9f4e00b 100644
> --- a/fs/cifs/smb2misc.c
> +++ b/fs/cifs/smb2misc.c
> @@ -150,7 +150,8 @@ smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
> }
> return 1;
> }
> - if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
> + if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE -
> + srvr->vals->header_preamble_size) {
> cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
> mid);
> return 1;
> @@ -189,26 +190,26 @@ smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
> }
> }
>
> - if (4 + len != length) {
> + if (srvr->vals->header_preamble_size + len != length) {
> cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
> - length, 4 + len, mid);
> + length, srvr->vals->header_preamble_size + len, mid);
> return 1;
> }
>
> clc_len = smb2_calc_size(hdr);
>
> - if (4 + len != clc_len) {
> + if (srvr->vals->header_preamble_size + len != clc_len) {
> cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
> - clc_len, 4 + len, mid);
> + clc_len, srvr->vals->header_preamble_size + len, mid);
> /* create failed on symlink */
> if (command == SMB2_CREATE_HE &&
> shdr->Status == STATUS_STOPPED_ON_SYMLINK)
> return 0;
> /* Windows 7 server returns 24 bytes more */
> - if (clc_len + 20 == len && command == SMB2_OPLOCK_BREAK_HE)
> + if (clc_len + 24 - srvr->vals->header_preamble_size == len && command == SMB2_OPLOCK_BREAK_HE)
> return 0;
> /* server can return one byte more due to implied bcc[0] */
> - if (clc_len == 4 + len + 1)
> + if (clc_len == srvr->vals->header_preamble_size + len + 1)
> return 0;
>
> /*
> @@ -218,10 +219,10 @@ smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
> * Log the server error (once), but allow it and continue
> * since the frame is parseable.
> */
> - if (clc_len < 4 /* RFC1001 header size */ + len) {
> + if (clc_len < srvr->vals->header_preamble_size /* RFC1001 header size */ + len) {
> printk_once(KERN_WARNING
> "SMB2 server sent bad RFC1001 len %d not %d\n",
> - len, clc_len - 4);
> + len, clc_len - srvr->vals->header_preamble_size);
> return 0;
> }
>
> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> index dfd6fb02b7a3..04a70e78fefa 100644
> --- a/fs/cifs/smb2ops.c
> +++ b/fs/cifs/smb2ops.c
> @@ -1457,6 +1457,8 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
> unsigned int sub_offset;
> unsigned int print_len;
> unsigned int print_offset;
> + struct cifs_ses *ses = tcon->ses;
> + struct TCP_Server_Info *server = ses->server;
>
> cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
>
> @@ -1479,7 +1481,7 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
> }
>
> if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
> - get_rfc1002_length(err_buf) + 4 < SMB2_SYMLINK_STRUCT_SIZE) {
> + get_rfc1002_length(err_buf) + server->vals->header_preamble_size < SMB2_SYMLINK_STRUCT_SIZE) {
> kfree(utf16_path);
> return -ENOENT;
> }
> @@ -1492,13 +1494,13 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
> print_len = le16_to_cpu(symlink->PrintNameLength);
> print_offset = le16_to_cpu(symlink->PrintNameOffset);
>
> - if (get_rfc1002_length(err_buf) + 4 <
> + if (get_rfc1002_length(err_buf) + server->vals->header_preamble_size <
> SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
> kfree(utf16_path);
> return -ENOENT;
> }
>
> - if (get_rfc1002_length(err_buf) + 4 <
> + if (get_rfc1002_length(err_buf) + server->vals->header_preamble_size <
> SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
> kfree(utf16_path);
> return -ENOENT;
> @@ -2050,7 +2052,8 @@ smb2_dir_needs_close(struct cifsFileInfo *cfile)
> }
>
> static void
> -fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, struct smb_rqst *old_rq)
> +fill_transform_hdr(struct TCP_Server_Info *server,
> + struct smb2_transform_hdr *tr_hdr, struct smb_rqst *old_rq)
> {
> struct smb2_sync_hdr *shdr =
> (struct smb2_sync_hdr *)old_rq->rq_iov[1].iov_base;
> @@ -2062,7 +2065,7 @@ fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, struct smb_rqst *old_rq)
> tr_hdr->Flags = cpu_to_le16(0x01);
> get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
> memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
> - inc_rfc1001_len(tr_hdr, sizeof(struct smb2_transform_hdr) - 4);
> + inc_rfc1001_len(tr_hdr, sizeof(struct smb2_transform_hdr) - server->vals->header_preamble_size);
> inc_rfc1001_len(tr_hdr, orig_len);
> }
>
> @@ -2134,7 +2137,7 @@ crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
> {
> struct smb2_transform_hdr *tr_hdr =
> (struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base;
> - unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
> + unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20 - server->vals->header_preamble_size;
> int rc = 0;
> struct scatterlist *sg;
> u8 sign[SMB2_SIGNATURE_SIZE] = {};
> @@ -2262,7 +2265,7 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
> goto err_free_iov;
>
> /* fill the 1st iov with a transform header */
> - fill_transform_hdr(tr_hdr, old_rq);
> + fill_transform_hdr(server, tr_hdr, old_rq);
> new_rq->rq_iov[0].iov_base = tr_hdr;
> new_rq->rq_iov[0].iov_len = sizeof(struct smb2_transform_hdr);
>
> @@ -2344,10 +2347,10 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
> if (rc)
> return rc;
>
> - memmove(buf + 4, iov[1].iov_base, buf_data_size);
> + memmove(buf + server->vals->header_preamble_size, iov[1].iov_base, buf_data_size);
> hdr = (struct smb2_hdr *)buf;
> hdr->smb2_buf_length = cpu_to_be32(buf_data_size + page_data_size);
> - server->total_read = buf_data_size + page_data_size + 4;
> + server->total_read = buf_data_size + page_data_size + server->vals->header_preamble_size;
>
> return rc;
> }
> @@ -2451,7 +2454,7 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
> return 0;
> }
>
> - data_offset = server->ops->read_data_offset(buf) + 4;
> + data_offset = server->ops->read_data_offset(buf) + server->vals->header_preamble_size;
> #ifdef CONFIG_CIFS_SMB_DIRECT
> use_rdma_mr = rdata->mr;
> #endif
> @@ -2547,11 +2550,12 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
> unsigned int npages;
> struct page **pages;
> unsigned int len;
> - unsigned int buflen = get_rfc1002_length(buf) + 4;
> + unsigned int buflen = get_rfc1002_length(buf) + server->vals->header_preamble_size;
> int rc;
> int i = 0;
>
> - len = min_t(unsigned int, buflen, server->vals->read_rsp_size - 4 +
> + len = min_t(unsigned int, buflen, server->vals->read_rsp_size -
> + server->vals->header_preamble_size +
> sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
>
> rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
> @@ -2559,8 +2563,9 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
> return rc;
> server->total_read += rc;
>
> - len = le32_to_cpu(tr_hdr->OriginalMessageSize) + 4 -
> - server->vals->read_rsp_size;
> + len = le32_to_cpu(tr_hdr->OriginalMessageSize) +
> + server->vals->header_preamble_size -
> + server->vals->read_rsp_size;
> npages = DIV_ROUND_UP(len, PAGE_SIZE);
>
> pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
> @@ -2586,7 +2591,8 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
> if (rc)
> goto free_pages;
>
> - rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size - 4,
> + rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size -
> + server->vals->header_preamble_size,
> pages, npages, len);
> if (rc)
> goto free_pages;
> @@ -2623,7 +2629,7 @@ receive_encrypted_standard(struct TCP_Server_Info *server,
> struct mid_q_entry *mid_entry;
>
> /* switch to large buffer if too big for a small one */
> - if (pdu_length + 4 > MAX_CIFS_SMALL_BUFFER_SIZE) {
> + if (pdu_length + server->vals->header_preamble_size > MAX_CIFS_SMALL_BUFFER_SIZE) {
> server->large_buf = true;
> memcpy(server->bigbuf, buf, server->total_read);
> buf = server->bigbuf;
> @@ -2631,12 +2637,13 @@ receive_encrypted_standard(struct TCP_Server_Info *server,
>
> /* now read the rest */
> length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
> - pdu_length - HEADER_SIZE(server) + 1 + 4);
> + pdu_length - HEADER_SIZE(server) + 1 +
> + server->vals->header_preamble_size);
> if (length < 0)
> return length;
> server->total_read += length;
>
> - buf_size = pdu_length + 4 - sizeof(struct smb2_transform_hdr);
> + buf_size = pdu_length + server->vals->header_preamble_size - sizeof(struct smb2_transform_hdr);
> length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
> if (length)
> return length;
> @@ -2665,7 +2672,7 @@ smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid)
> struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
> unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
>
> - if (pdu_length + 4 < sizeof(struct smb2_transform_hdr) +
> + if (pdu_length + server->vals->header_preamble_size < sizeof(struct smb2_transform_hdr) +
> sizeof(struct smb2_sync_hdr)) {
> cifs_dbg(VFS, "Transform message is too small (%u)\n",
> pdu_length);
> @@ -2674,14 +2681,14 @@ smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid)
> return -ECONNABORTED;
> }
>
> - if (pdu_length + 4 < orig_len + sizeof(struct smb2_transform_hdr)) {
> + if (pdu_length + server->vals->header_preamble_size < orig_len + sizeof(struct smb2_transform_hdr)) {
> cifs_dbg(VFS, "Transform message is broken\n");
> cifs_reconnect(server);
> wake_up(&server->response_q);
> return -ECONNABORTED;
> }
>
> - if (pdu_length + 4 > CIFSMaxBufSize + MAX_HEADER_SIZE(server))
> + if (pdu_length + server->vals->header_preamble_size > CIFSMaxBufSize + MAX_HEADER_SIZE(server))
> return receive_encrypted_read(server, mid);
>
> return receive_encrypted_standard(server, mid);
> @@ -2692,7 +2699,8 @@ smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
> {
> char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
>
> - return handle_read_data(server, mid, buf, get_rfc1002_length(buf) + 4,
> + return handle_read_data(server, mid, buf, get_rfc1002_length(buf) +
> + server->vals->header_preamble_size,
> NULL, 0, 0);
> }
>
> @@ -3097,6 +3105,7 @@ struct smb_version_values smb20_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> @@ -3117,6 +3126,7 @@ struct smb_version_values smb21_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> @@ -3137,6 +3147,7 @@ struct smb_version_values smb3any_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> @@ -3157,6 +3168,7 @@ struct smb_version_values smbdefault_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> @@ -3177,6 +3189,7 @@ struct smb_version_values smb30_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> @@ -3197,6 +3210,7 @@ struct smb_version_values smb302_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> @@ -3218,6 +3232,7 @@ struct smb_version_values smb311_values = {
> .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
> .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
> .header_size = sizeof(struct smb2_hdr),
> + .header_preamble_size = 4,
> .max_header_size = MAX_SMB2_HDR_SIZE,
> .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
> .lock_cmd = SMB2_LOCK,
> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
> index 4b6920de2541..1e765b31eb88 100644
> --- a/fs/cifs/smb2pdu.c
> +++ b/fs/cifs/smb2pdu.c
> @@ -1466,7 +1466,7 @@ parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
> unsigned int remaining;
> char *name;
>
> - data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
> + data_offset = (char *)rsp + server->vals->header_preamble_size + le32_to_cpu(rsp->CreateContextsOffset);
> remaining = le32_to_cpu(rsp->CreateContextsLength);
> cc = (struct create_context *)data_offset;
> while (remaining >= sizeof(struct create_context)) {
> @@ -3447,6 +3447,7 @@ static int
> build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
> int outbuf_len, u64 persistent_fid, u64 volatile_fid)
> {
> + struct TCP_Server_Info *server = tcon->ses->server;
> int rc;
> struct smb2_query_info_req *req;
> unsigned int total_len;
> @@ -3469,7 +3470,7 @@ build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
> req->InputBufferOffset =
> cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
> req->OutputBufferLength = cpu_to_le32(
> - outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
> + outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - server->vals->header_preamble_size);
>
> iov->iov_base = (char *)req;
> iov->iov_len = total_len;
> @@ -3486,6 +3487,7 @@ SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
> int rc = 0;
> int resp_buftype;
> struct cifs_ses *ses = tcon->ses;
> + struct TCP_Server_Info *server = ses->server;
> struct smb2_fs_full_size_info *info = NULL;
> int flags = 0;
>
> @@ -3506,7 +3508,7 @@ SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
> }
> rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
>
> - info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
> + info = (struct smb2_fs_full_size_info *)(server->vals->header_preamble_size +
> le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
> rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
> le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
> @@ -3529,6 +3531,7 @@ SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
> int rc = 0;
> int resp_buftype, max_len, min_len;
> struct cifs_ses *ses = tcon->ses;
> + struct TCP_Server_Info *server = ses->server;
> unsigned int rsp_len, offset;
> int flags = 0;
>
> @@ -3569,15 +3572,15 @@ SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
> goto qfsattr_exit;
>
> if (level == FS_ATTRIBUTE_INFORMATION)
> - memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
> + memcpy(&tcon->fsAttrInfo, server->vals->header_preamble_size + offset
> + (char *)&rsp->hdr, min_t(unsigned int,
> rsp_len, max_len));
> else if (level == FS_DEVICE_INFORMATION)
> - memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
> + memcpy(&tcon->fsDevInfo, server->vals->header_preamble_size + offset
> + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
> else if (level == FS_SECTOR_SIZE_INFORMATION) {
> struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
> - (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
> + (server->vals->header_preamble_size + offset + (char *)&rsp->hdr);
> tcon->ss_flags = le32_to_cpu(ss_info->Flags);
> tcon->perf_sector_size =
> le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
> diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
> index 665661464067..279718dcb2ed 100644
> --- a/fs/cifs/transport.c
> +++ b/fs/cifs/transport.c
> @@ -790,7 +790,8 @@ cifs_send_recv(const unsigned int xid, struct cifs_ses *ses,
>
> buf = (char *)midQ->resp_buf;
> resp_iov->iov_base = buf;
> - resp_iov->iov_len = get_rfc1002_length(buf) + 4;
> + resp_iov->iov_len = get_rfc1002_length(buf) +
> + ses->server->vals->header_preamble_size;
> if (midQ->large_buf)
> *resp_buf_type = CIFS_LARGE_BUFFER;
> else
> --
> 2.13.3
>
> --
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Looks good. We need to try looking for other ways to split patch #2.
Reviewed-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx>
--
Best regards,
Pavel Shilovsky
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