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selftests/bpf: Fix check_mtu using wrong variable type

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Dan Carpenter found via Smatch static checker, that unsigned 'mtu_lo' is
never less than zero.

Variable mtu_lo should have been an 'int', because read_mtu_device_lo()
uses minus as error indications.

Fixes: b62eba5632 ("selftests/bpf: Tests using bpf_check_mtu BPF-helper")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/bpf/168605104733.3636467.17945947801753092590.stgit@firesoul
This commit is contained in:
Jesper Dangaard Brouer 2023-06-06 13:30:47 +02:00 committed by Daniel Borkmann
parent aa6182707a
commit 095641817e
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/prog_tests/check_mtu.c
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@ -183,7 +183,7 @@ cleanup:
void serial_test_check_mtu(void)
{
__u32 mtu_lo;
int mtu_lo;
if (test__start_subtest("bpf_check_mtu XDP-attach"))
test_check_mtu_xdp_attach();