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NFSv4: Clean up owner/group attribute decode

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Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2017-02-19 16:08:32 -05:00 committed by Anna Schumaker
parent 5c741d4f22
commit 686a816ab6
1 changed files with 57 additions and 60 deletions
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117
fs/nfs/nfs4xdr.c
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@ -3875,45 +3875,50 @@ out_overflow:
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 != -EBADMSG)
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 != -EBADMSG)
return 0;
print_overflow_msg(__func__, xdr);
return -EIO;
}