@@ -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 != -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;
}