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CIFS: Calculate the correct request length based on page offset and tail size 

It's possible that the page offset is non-zero in the pages in a request,
change the function to calculate the correct data buffer length.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Long Li 2018-05-30 12:47:57 -07:00 committed by Steve French
parent ee25c6dd7b
commit c06a0f2dff
1 changed files with 17 additions and 3 deletions
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20
fs/cifs/transport.c
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@ -212,10 +212,24 @@ rqst_len(struct smb_rqst *rqst)
for (i = 0; i < rqst->rq_nvec; i++)
buflen += iov[i].iov_len;
/* add in the page array if there is one */
/*
* Add in the page array if there is one. The caller needs to make
* sure rq_offset and rq_tailsz are set correctly. If a buffer of
* multiple pages ends at page boundary, rq_tailsz needs to be set to
* PAGE_SIZE.
*/
if (rqst->rq_npages) {
buflen += rqst->rq_pagesz * (rqst->rq_npages - 1);
buflen += rqst->rq_tailsz;
if (rqst->rq_npages == 1)
buflen += rqst->rq_tailsz;
else {
/*
* If there is more than one page, calculate the
* buffer length based on rq_offset and rq_tailsz
*/
buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) -
rqst->rq_offset;
buflen += rqst->rq_tailsz;
}
}
return buflen;