6ba147485e
Currently, link_queue_request_safe(), which is a wrapper of request_new(), is called with a free function at - link_request_stacked_netdev() at netdev/netdev.c, - link_request_address() at networkd-address.c, - link_request_nexthop() at networkd-nexthop.c, - link_request_neighbor() at networkd-networkd.c. For the netdev case, the reference counter of the passed object is increased only when the function returns 1. So, on failure (with -ENOMEM) previously we unexpectedly dropped the reference of the NetDev object. Similarly, for Address and friends, the ownership of the object is moved to the Request object only when the function returns 1. And on failure, previously the object was freed twice. Also, netdev_queue_request(), which is another wrapper of request_new() potentially leaks memory when the same NetDev object is queued twice. Fortunately, that should not happen as the function is called only once per object. This fixes the above issue, and now the ownership or the reference counter of the object is changed only when it is succeeded with 1.
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