cifs: Use correct packet length in SMB2_TRANSFORM header

In smb3_init_transform_rq(), 'orig_len' was only counting the request
length, but forgot to count any data pages in the request.

Writing or creating files with the 'seal' mount option was broken.

In addition, do some code refactoring by exporting smb2_rqst_len() to
calculate the appropriate packet size and avoid duplicating the same
calculation all over the code.

The start of the io vector is either the rfc1002 length (4 bytes) or a
SMB2 header which is always > 4. Use this fact to check and skip the
rfc1002 length if requested.

Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 5 insertions, 14 deletions

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index e459c97151b3..6fd94d9ffac2 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -18,6 +18,7 @@
 #include "smbdirect.h"
 #include "cifs_debug.h"
 #include "cifsproto.h"
+#include "smb2proto.h"
 
 static struct smbd_response *get_empty_queue_buffer(
 		struct smbd_connection *info);
@@ -2087,7 +2088,7 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
 	struct kvec vec;
 	int nvecs;
 	int size;
-	unsigned int buflen = 0, remaining_data_length;
+	unsigned int buflen, remaining_data_length;
 	int start, i, j;
 	int max_iov_size =
 		info->max_send_size - sizeof(struct smbd_data_transfer);
@@ -2111,25 +2112,13 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
 		log_write(ERR, "expected the pdu length in 1st iov, but got %zu\n", rqst->rq_iov[0].iov_len);
 		return -EINVAL;
 	}
-	iov = &rqst->rq_iov[1];
-
-	/* total up iov array first */
-	for (i = 0; i < rqst->rq_nvec-1; i++) {
-		buflen += iov[i].iov_len;
-	}
 
 	/*
 	 * Add in the page array if there is one. The caller needs to set
 	 * rq_tailsz to PAGE_SIZE when the buffer has multiple pages and
 	 * ends at page boundary
 	 */
-	if (rqst->rq_npages) {
-		if (rqst->rq_npages == 1)
-			buflen += rqst->rq_tailsz;
-		else
-			buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) -
-					rqst->rq_offset + rqst->rq_tailsz;
-	}
+	buflen = smb2_rqst_len(rqst, true);
 
 	if (buflen + sizeof(struct smbd_data_transfer) >
 		info->max_fragmented_send_size) {
@@ -2139,6 +2128,8 @@ int smbd_send(struct smbd_connection *info, struct smb_rqst *rqst)
 		goto done;
 	}
 
+	iov = &rqst->rq_iov[1];
+
 	cifs_dbg(FYI, "Sending smb (RDMA): smb_len=%u\n", buflen);
 	for (i = 0; i < rqst->rq_nvec-1; i++)
 		dump_smb(iov[i].iov_base, iov[i].iov_len);