tipc: compat: allow tipc commands without arguments

Commit 2753ca5d90 ("tipc: fix uninit-value in tipc_nl_compat_doit")
broke older tipc tools that use compat interface (e.g. tipc-config from
tipcutils package):

% tipc-config -p
operation not supported

The commit started to reject TIPC netlink compat messages that do not
have attributes. It is too restrictive because some of such messages are
valid (they don't need any arguments):

% grep 'tx none' include/uapi/linux/tipc_config.h
#define  TIPC_CMD_NOOP              0x0000    /* tx none, rx none */
#define  TIPC_CMD_GET_MEDIA_NAMES   0x0002    /* tx none, rx media_name(s) */
#define  TIPC_CMD_GET_BEARER_NAMES  0x0003    /* tx none, rx bearer_name(s) */
#define  TIPC_CMD_SHOW_PORTS        0x0006    /* tx none, rx ultra_string */
#define  TIPC_CMD_GET_REMOTE_MNG    0x4003    /* tx none, rx unsigned */
#define  TIPC_CMD_GET_MAX_PORTS     0x4004    /* tx none, rx unsigned */
#define  TIPC_CMD_GET_NETID         0x400B    /* tx none, rx unsigned */
#define  TIPC_CMD_NOT_NET_ADMIN     0xC001    /* tx none, rx none */

This patch relaxes the original fix and rejects messages without
arguments only if such arguments are expected by a command (reg_type is
non zero).

Fixes: 2753ca5d90 ("tipc: fix uninit-value in tipc_nl_compat_doit")
Cc: stable@vger.kernel.org
Signed-off-by: Taras Kondratiuk <takondra@cisco.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/netlink_compat.c

@@ -55,6 +55,7 @@ struct tipc_nl_compat_msg {
 	int rep_type;
 	int rep_size;
 	int req_type;
+	int req_size;
 	struct net *net;
 	struct sk_buff *rep;
 	struct tlv_desc *req;
@@ -257,7 +258,8 @@ static int tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 	int err;
 	struct sk_buff *arg;
 
-	if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
+	if (msg->req_type && (!msg->req_size ||
+			      !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 		return -EINVAL;
 
 	msg->rep = tipc_tlv_alloc(msg->rep_size);
@@ -354,7 +356,8 @@ static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
 {
 	int err;
 
-	if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
+	if (msg->req_type && (!msg->req_size ||
+			      !TLV_CHECK_TYPE(msg->req, msg->req_type)))
 		return -EINVAL;
 
 	err = __tipc_nl_compat_doit(cmd, msg);
@@ -1278,8 +1281,8 @@ static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
 		goto send;
 	}
 
-	len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
+	msg.req_size = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
-	if (!len || !TLV_OK(msg.req, len)) {
+	if (msg.req_size && !TLV_OK(msg.req, msg.req_size)) {
 		msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
 		err = -EOPNOTSUPP;
 		goto send;