bpf: fix error check in bpf_tcp_gen_syncookie

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If a SYN cookie is not issued by tcp_v#_gen_syncookie, then the return
value will be exactly 0, rather than <= 0. Let's change the check to
reflect that, especially since mss is an unsigned value and cannot be
negative.

Fixes: 70d6624431 ("bpf: add bpf_tcp_gen_syncookie helper")
Reported-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Petar Penkov <ppenkov@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Petar Penkov 2019-08-27 16:46:22 -07:00 • committed by Daniel Borkmann

parent 736a55309d

commit 0741be358d

1 changed files with 1 additions and 1 deletions

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net/core/filter.c

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