bpf: Don't refcount LISTEN sockets in sk_assign()

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Avoid taking a reference on listen sockets by checking the socket type
in the sk_assign and in the corresponding skb_steal_sock() code in the
the transport layer, and by ensuring that the prefetch free (sock_pfree)
function uses the same logic to check whether the socket is refcounted.

Suggested-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200329225342.16317-4-joe@wand.net.nz

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Joe Stringer 2020-03-29 15:53:40 -07:00 • committed by Alexei Starovoitov

parent 71489e21d7

commit 7ae215d23c

3 changed files with 22 additions and 12 deletions

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25

include/net/sock.h

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6

net/core/filter.c

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3

net/core/sock.c

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