consistently use smb_buf_length as be32 for cifs (try 3)

       There is one big endian field in the cifs protocol, the RFC1001
       length, which cifs code (unlike in the smb2 code) had been handling as
       u32 until the last possible moment, when it was converted to be32 (its
       native form) before sending on the wire.   To remove the last sparse
       endian warning, and to make this consistent with the smb2
       implementation  (which always treats the fields in their
       native size and endianness), convert all uses of smb_buf_length to
       be32.

       This version incorporates Christoph's comment about
       using be32_add_cpu, and fixes a typo in the second
       version of the patch.

Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 0c684ae4c071..533f863067e5 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -304,12 +304,10 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
 
         memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
 
-        buffer->smb_buf_length =
+        buffer->smb_buf_length = cpu_to_be32(
             (2 * word_count) + sizeof(struct smb_hdr) -
             4 /*  RFC 1001 length field does not count */  +
-            2 /* for bcc field itself */ ;
-        /* Note that this is the only network field that has to be converted
-           to big endian and it is done just before we send it */
+            2 /* for bcc field itself */) ;
 
         buffer->Protocol[0] = 0xFF;
         buffer->Protocol[1] = 'S';
@@ -424,7 +422,7 @@ check_smb_hdr(struct smb_hdr *smb, __u16 mid)
 int
 checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
 {
-        __u32 len = smb->smb_buf_length;
+        __u32 len = be32_to_cpu(smb->smb_buf_length);
         __u32 clc_len;  /* calculated length */
         cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len);