Return-Path: Received: from mail-it0-f66.google.com ([209.85.214.66]:36809 "EHLO mail-it0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751745AbdBSS7V (ORCPT ); Sun, 19 Feb 2017 13:59:21 -0500 Received: by mail-it0-f66.google.com with SMTP id w185so2677084ita.3 for ; Sun, 19 Feb 2017 10:59:21 -0800 (PST) From: Trond Myklebust To: Anna Schumaker , Chuck Lever Cc: linux-nfs@vger.kernel.org Subject: [PATCH v4 8/8] NFSv4: Clean up owner/group attribute decode Date: Sun, 19 Feb 2017 13:59:03 -0500 Message-Id: <20170219185903.42043-9-trond.myklebust@primarydata.com> In-Reply-To: <20170219185903.42043-8-trond.myklebust@primarydata.com> References: <20170219185903.42043-1-trond.myklebust@primarydata.com> <20170219185903.42043-2-trond.myklebust@primarydata.com> <20170219185903.42043-3-trond.myklebust@primarydata.com> <20170219185903.42043-4-trond.myklebust@primarydata.com> <20170219185903.42043-5-trond.myklebust@primarydata.com> <20170219185903.42043-6-trond.myklebust@primarydata.com> <20170219185903.42043-7-trond.myklebust@primarydata.com> <20170219185903.42043-8-trond.myklebust@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Signed-off-by: Trond Myklebust --- fs/nfs/nfs4xdr.c | 117 +++++++++++++++++++++++++++---------------------------- 1 file changed, 57 insertions(+), 60 deletions(-) diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index f5df18f99bd4..afe7f40add05 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -3875,45 +3875,50 @@ static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t return -EIO; } +static ssize_t decode_nfs4_string(struct xdr_stream *xdr, + struct nfs4_string *name, gfp_t gfp_flags) +{ + ssize_t ret; + + ret = xdr_stream_decode_string_dup(xdr, &name->data, + XDR_MAX_NETOBJ, gfp_flags); + name->len = 0; + if (ret > 0) + name->len = ret; + return ret; +} + static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap, const struct nfs_server *server, kuid_t *uid, struct nfs4_string *owner_name) { - uint32_t len; - __be32 *p; - int ret = 0; + ssize_t len; + char *p; *uid = make_kuid(&init_user_ns, -2); if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U))) return -EIO; - if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) { - p = xdr_inline_decode(xdr, 4); - if (unlikely(!p)) - goto out_overflow; - len = be32_to_cpup(p); - p = xdr_inline_decode(xdr, len); - if (unlikely(!p)) - goto out_overflow; - if (owner_name != NULL) { - owner_name->data = kmemdup(p, len, GFP_NOWAIT); - if (owner_name->data != NULL) { - owner_name->len = len; - ret = NFS_ATTR_FATTR_OWNER_NAME; - } - } else if (len < XDR_MAX_NETOBJ) { - if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0) - ret = NFS_ATTR_FATTR_OWNER; - else - dprintk("%s: nfs_map_name_to_uid failed!\n", - __func__); - } else - dprintk("%s: name too long (%u)!\n", - __func__, len); - bitmap[1] &= ~FATTR4_WORD1_OWNER; + if (!(bitmap[1] & FATTR4_WORD1_OWNER)) + return 0; + bitmap[1] &= ~FATTR4_WORD1_OWNER; + + if (owner_name != NULL) { + len = decode_nfs4_string(xdr, owner_name, GFP_NOWAIT); + if (len <= 0) + goto out; + dprintk("%s: name=%s\n", __func__, owner_name->data); + return NFS_ATTR_FATTR_OWNER_NAME; + } else { + len = xdr_stream_decode_opaque_inline(xdr, (void **)&p, + XDR_MAX_NETOBJ); + if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0) + goto out; + dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid)); + return NFS_ATTR_FATTR_OWNER; } - dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid)); - return ret; -out_overflow: +out: + if (len != -ENOBUFS) + return 0; print_overflow_msg(__func__, xdr); return -EIO; } @@ -3922,41 +3927,33 @@ static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap, const struct nfs_server *server, kgid_t *gid, struct nfs4_string *group_name) { - uint32_t len; - __be32 *p; - int ret = 0; + ssize_t len; + char *p; *gid = make_kgid(&init_user_ns, -2); if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U))) return -EIO; - if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) { - p = xdr_inline_decode(xdr, 4); - if (unlikely(!p)) - goto out_overflow; - len = be32_to_cpup(p); - p = xdr_inline_decode(xdr, len); - if (unlikely(!p)) - goto out_overflow; - if (group_name != NULL) { - group_name->data = kmemdup(p, len, GFP_NOWAIT); - if (group_name->data != NULL) { - group_name->len = len; - ret = NFS_ATTR_FATTR_GROUP_NAME; - } - } else if (len < XDR_MAX_NETOBJ) { - if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0) - ret = NFS_ATTR_FATTR_GROUP; - else - dprintk("%s: nfs_map_group_to_gid failed!\n", - __func__); - } else - dprintk("%s: name too long (%u)!\n", - __func__, len); - bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP; + if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) + return 0; + bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP; + + if (group_name != NULL) { + len = decode_nfs4_string(xdr, group_name, GFP_NOWAIT); + if (len <= 0) + goto out; + dprintk("%s: name=%s\n", __func__, group_name->data); + return NFS_ATTR_FATTR_OWNER_NAME; + } else { + len = xdr_stream_decode_opaque_inline(xdr, (void **)&p, + XDR_MAX_NETOBJ); + if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0) + goto out; + dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid)); + return NFS_ATTR_FATTR_GROUP; } - dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid)); - return ret; -out_overflow: +out: + if (len != -ENOBUFS) + return 0; print_overflow_msg(__func__, xdr); return -EIO; } -- 2.9.3