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tools/bpftool: Fix attaching flow dissector

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My earlier patch to reject non-zero arguments to flow dissector attach
broke attaching via bpftool. Instead of 0 it uses -1 for target_fd.
Fix this by passing a zero argument when attaching the flow dissector.

Fixes: 1b514239e8 ("bpf: flow_dissector: Check value of unused flags to BPF_PROG_ATTACH")
Reported-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20201105115230.296657-1-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer 2020-11-05 11:52:30 +00:00 committed by Alexei Starovoitov
parent 25cf73b9ff
commit f9b7ff0d7f
1 changed files with 1 additions and 1 deletions
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tools/bpf/bpftool/prog.c
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@ -940,7 +940,7 @@ static int parse_attach_detach_args(int argc, char **argv, int *progfd,
}
if (*attach_type == BPF_FLOW_DISSECTOR) {
*mapfd = -1;
*mapfd = 0;
return 0;
}