Re: [PATCH] netlink: fix memory leak

[Florian Westphal <fw@strlen.de>]

Shaochun Chen <cscnull@gmail.com> wrote:

[ CC Tom Herbert ]

> and the memory which pointed by control->data will leak. so if netlink_dump
> start fail, call control->done to free the memory.

Tom, I was about to suggest moving extra allocations for dumps
into a ->start() callback whereever possible.

However, it looks like ->done() is not guaranteed to be called even if
->start() was invoked, but it seems at least ila assumes ->done always
cleans up after ->start.

I am looking at netlink_dump(); it calls ->done() only after the dump
callback was invoked.

In nf_tables_api.c case it might be possible to defer allocations until
->dump() is called for first time via cb_args but I don't think its
going to be any better than cleaning up manually after netlink_dump_start()
returned an error.

Any better ideas or advice on how to procceed?

Thanks!