[PATCH bpf 0/1] Fix memory leak in helpers dealing with sockets
From: Lorenz Bauer
Date: Thu Jan 09 2020 - 06:58:48 EST
While rolling out a new BPF based TC classifier I hit a memory leak, which
manifests in large numbers of request and time wait sockets not being released.
The root cause is that the current BPF helpers dealing with sockets are naive:
they assume that sk->sk_flags is always valid. struct request_sock and
struct inet_timewait_sock break this.
I've fixed this up by adding a helper that checks sk_state in addition to sk_flags.
The solution is a bit clumsy: it encapsulates details of struct sock in BPF.
It would probably be nicer to have a sock_gen_put + SOCK_RCU_FREE function exposed
in sock.h, but that might be too big a change for backports.
Thoughts?
Lorenz Bauer (1):
net: bpf: don't leak time wait and request sockets
net/core/filter.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
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2.20.1