selftests/bpf: check return value of fopen in test_verifier.c
Commit 0a674874 ("selftests/bpf: Only run tests if !bpf_disabled") forgot to check return value of fopen. This caused some confusion, when running test_verifier (from tools/testing/selftests/bpf/) on an older kernel (< v4.4) as it will simply seqfault. This fix avoids the segfault and prints an error, but allow program to continue. Given the sysctl was introduced in 1be7f75d ("bpf: enable non-root eBPF programs"), we know that the running kernel cannot support unpriv, thus continue with unpriv_disabled = true. Fixes: 0a674874 ("selftests/bpf: Only run tests if !bpf_disabled") Signed-off-by: NJesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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