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Commit cff298c7 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

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: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent b291f1b1

fs/nfs/nfs4xdr.c

+6 −5
Original line number Diff line number Diff line
@@ -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