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Date:   Wed, 13 Feb 2019 12:41:13 -0800
From:   Peter Oskolkov <>
To:     David Ahern <>
Cc:     Alexei Starovoitov <>,
        Daniel Borkmann <>,
        netdev <>, Peter Oskolkov <>,
        Willem de Bruijn <>
Subject: Re: [PATCH bpf-next v10 5/7] bpf: add handling of BPF_LWT_REROUTE to lwt_bpf.c

On Wed, Feb 13, 2019 at 12:11 PM David Ahern <> wrote:
> On 2/13/19 12:57 PM, Peter Oskolkov wrote:
> > Thanks, David! I was not able to reproduce the leak, but based on your
> > suggestion and similar code elsewhere I made a change in v11 to explicitly
> > release a dst with error.
> ok. Did you run the test with a debug kernel - checking refcount, use
> after free, etc?

In my tests I was always getting ERR_PTR for unroutable packets,
not a full rt/dst with an error flag set. But I checked several
similar route lookups,
and they all release bad dsts, so I did not feel it was worth it to
investigate further.

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