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CIFS: Pass page offset for encrypting

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Encryption function needs to read data starting page offset from input
buffer.

This doesn't affect decryption path since it allocates its own page
buffers.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2018-06-05 17:46:24 -05:00
parent 4c0d2a5a64
commit d5f07fb3ef
1 changed files with 13 additions and 7 deletions
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20
fs/cifs/smb2ops.c
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@ -2189,9 +2189,10 @@ init_sg(struct smb_rqst *rqst, u8 *sign)
smb2_sg_set_buf(&sg[i], rqst->rq_iov[i+1].iov_base,
rqst->rq_iov[i+1].iov_len);
for (j = 0; i < sg_len - 1; i++, j++) {
unsigned int len = (j < rqst->rq_npages - 1) ? rqst->rq_pagesz
: rqst->rq_tailsz;
sg_set_page(&sg[i], rqst->rq_pages[j], len, 0);
unsigned int len, offset;
rqst_page_get_length(rqst, j, &len, &offset);
sg_set_page(&sg[i], rqst->rq_pages[j], len, offset);
}
smb2_sg_set_buf(&sg[sg_len - 1], sign, SMB2_SIGNATURE_SIZE);
return sg;
@ -2338,6 +2339,7 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
return rc;
new_rq->rq_pages = pages;
new_rq->rq_offset = old_rq->rq_offset;
new_rq->rq_npages = old_rq->rq_npages;
new_rq->rq_pagesz = old_rq->rq_pagesz;
new_rq->rq_tailsz = old_rq->rq_tailsz;
@ -2379,10 +2381,14 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
/* copy pages form the old */
for (i = 0; i < npages; i++) {
char *dst = kmap(new_rq->rq_pages[i]);
char *src = kmap(old_rq->rq_pages[i]);
unsigned int len = (i < npages - 1) ? new_rq->rq_pagesz :
new_rq->rq_tailsz;
char *dst, *src;
unsigned int offset, len;
rqst_page_get_length(new_rq, i, &len, &offset);
dst = (char *) kmap(new_rq->rq_pages[i]) + offset;
src = (char *) kmap(old_rq->rq_pages[i]) + offset;
memcpy(dst, src, len);
kunmap(new_rq->rq_pages[i]);
kunmap(old_rq->rq_pages[i]);