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NFSv4: Don't use private xdr_stream fields in decode_getacl 

Instead of using the private field xdr->p from struct xdr_stream,
use the public xdr_stream_pos().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-08-14 17:14:17 -04:00
parent b291f1b1c8
commit cff298c721
1 changed files with 6 additions and 5 deletions
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11
fs/nfs/nfs4xdr.c
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@ -5045,10 +5045,10 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
struct nfs_getaclres *res)
{
unsigned int savep;
__be32 *bm_p;
uint32_t attrlen,
bitmap[3] = {0};
int status;
unsigned int pg_offset;
res->acl_len = 0;
if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
@ -5056,7 +5056,8 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
xdr_enter_page(xdr, xdr->buf->page_len);
bm_p = xdr->p;
/* Calculate the offset of the page data */
pg_offset = xdr->buf->head[0].iov_len;
if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
goto out;
@ -5070,18 +5071,18 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
/* The bitmap (xdr len + bitmaps) and the attr xdr len words
* are stored with the acl data to handle the problem of
* variable length bitmaps.*/
res->acl_data_offset = (xdr->p - bm_p) << 2;
res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
/* We ignore &savep and don't do consistency checks on
* the attr length. Let userspace figure it out.... */
res->acl_len = attrlen;
if (attrlen + res->acl_data_offset > xdr->buf->page_len) {
if (attrlen > (xdr->nwords << 2)) {
if (res->acl_flags & NFS4_ACL_LEN_REQUEST) {
/* getxattr interface called with a NULL buf */
goto out;
}
dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
attrlen, xdr->buf->page_len);
attrlen, xdr->nwords << 2);
return -EINVAL;
}
} else