net/netlink_compat: Fix a missing check of nla_parse_nested

[ Upstream commit 89dfd008 ]

In tipc_nl_compat_sk_dump(), if nla_parse_nested() fails, it could return
an error. To be consistent with other invocations of the function call,
on error, the fix passes the return value upstream.
Signed-off-by: NAditya Pakki <pakki001@umn.edu>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

net/tipc/netlink_compat.c

@@ -1030,8 +1030,11 @@ static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
 		u32 node;
 		struct nlattr *con[TIPC_NLA_CON_MAX + 1];
 
-		nla_parse_nested(con, TIPC_NLA_CON_MAX,
-				 sock[TIPC_NLA_SOCK_CON], NULL, NULL);
+		err = nla_parse_nested(con, TIPC_NLA_CON_MAX,
+				       sock[TIPC_NLA_SOCK_CON], NULL, NULL);
+
+		if (err)
+			return err;
 
 		node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
 		tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",