From: Paolo Abeni <pab...@redhat.com> Date: Fri, 8 Jun 2018 11:35:40 +0200
> After commit 6b229cf77d68 ("udp: add batching to udp_rmem_release()") > the sk_rmem_alloc field does not measure exactly anymore the > receive queue length, because we batch the rmem release. The issue > is really apparent only after commit 0d4a6608f68c ("udp: do rmem bulk > free even if the rx sk queue is empty"): the user space can easily > check for an empty socket with not-0 queue length reported by the 'ss' > tool or the procfs interface. > > We need to use a custom UDP helper to report the correct queue length, > taking into account the forward allocation deficit. > > Reported-by: trevor.fran...@46labs.com > Fixes: 6b229cf77d68 ("UDP: add batching to udp_rmem_release()") > Signed-off-by: Paolo Abeni <pab...@redhat.com> Applied and queued up for -stable, thanks.