[PATCH] selftests/bpf: check return value of fopen in test_verifier.c

[Jesper Dangaard Brouer]

Commit 0a6748740368 ("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 1be7f75d1668 ("bpf:
enable non-root eBPF programs"), we know that the running kernel
cannot support unpriv, thus continue with unpriv_disabled = true.

Fixes: 0a6748740368 ("selftests/bpf: Only run tests if !bpf_disabled")
Signed-off-by: Jesper Dangaard Brouer <bro...@redhat.com>
---
 tools/testing/selftests/bpf/test_verifier.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/bpf/test_verifier.c 
b/tools/testing/selftests/bpf/test_verifier.c
index a877af00605d..94498eaf872e 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -12337,6 +12337,11 @@ static void get_unpriv_disabled()
        FILE *fd;
 
        fd = fopen("/proc/sys/"UNPRIV_SYSCTL, "r");
+       if (!fd) {
+               perror("fopen /proc/sys/"UNPRIV_SYSCTL);
+               unpriv_disabled = true;
+               return;
+       }
        if (fgets(buf, 2, fd) == buf && atoi(buf))
                unpriv_disabled = true;
        fclose(fd);