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Commit 29a1bd6b authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

NFS: Use xdr_stream-based XDR encoder for MNT's dirpath argument 



Check the length of the supplied dirpath, and see that it fits
properly in the RPC buffer.

Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 2ad78097

fs/nfs/mount_clnt.c

+44 −5
Original line number Diff line number Diff line
@@ -20,6 +20,21 @@ 
# define NFSDBG_FACILITY	NFSDBG_MOUNT

#endif



/*

 * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4

 */

#define MNTPATHLEN		(1024)



/*

 * XDR data type sizes

 */

#define encode_dirpath_sz	(1 + XDR_QUADLEN(MNTPATHLEN))



/*

 * XDR argument and result sizes

 */

#define MNT_enc_dirpath_sz	encode_dirpath_sz



/*

 * Defined by RFC 1094, section A.5

 */
@@ -135,6 +150,31 @@ static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p, 
	return 0;

}



static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)

{

	const u32 pathname_len = strlen(pathname);

	__be32 *p;



	if (unlikely(pathname_len > MNTPATHLEN))

		return -EIO;



	p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);

	if (unlikely(p == NULL))

		return -EIO;

	xdr_encode_opaque(p, pathname, pathname_len);



	return 0;

}



static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,

			   const char *dirpath)

{

	struct xdr_stream xdr;



	xdr_init_encode(&xdr, &req->rq_snd_buf, p);

	return encode_mntdirpath(&xdr, dirpath);

}



static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,

			       struct mnt_fhstatus *res)

{
@@ -164,16 +204,15 @@ static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, 
	return 0;

}



#define MNT_dirpath_sz		(1 + 256)

#define MNT_fhstatus_sz		(1 + 8)

#define MNT_fhstatus3_sz	(1 + 16)



static struct rpc_procinfo mnt_procedures[] = {

	[MOUNTPROC_MNT] = {

		.p_proc		= MOUNTPROC_MNT,

		.p_encode	= (kxdrproc_t) xdr_encode_dirpath,

		.p_encode	= (kxdrproc_t)mnt_enc_dirpath,

		.p_decode	= (kxdrproc_t) xdr_decode_fhstatus,

		.p_arglen	= MNT_dirpath_sz,

		.p_arglen	= MNT_enc_dirpath_sz,

		.p_replen	= MNT_fhstatus_sz,

		.p_statidx	= MOUNTPROC_MNT,

		.p_name		= "MOUNT",
@@ -183,9 +222,9 @@ static struct rpc_procinfo mnt_procedures[] = { 
static struct rpc_procinfo mnt3_procedures[] = {

	[MOUNTPROC3_MNT] = {

		.p_proc		= MOUNTPROC3_MNT,

		.p_encode	= (kxdrproc_t) xdr_encode_dirpath,

		.p_encode	= (kxdrproc_t)mnt_enc_dirpath,

		.p_decode	= (kxdrproc_t) xdr_decode_fhstatus3,

		.p_arglen	= MNT_dirpath_sz,

		.p_arglen	= MNT_enc_dirpath_sz,

		.p_replen	= MNT_fhstatus3_sz,

		.p_statidx	= MOUNTPROC3_MNT,

		.p_name		= "MOUNT",