[bpf-next v2 03/10] selftests/bpf: Avoid another case of errno clobbering

[Krzesimir Nowak]

Commit 8184d44c9a57 ("selftests/bpf: skip verifier tests for
unsupported program types") added a check for an unsupported program
type. The function doing it changes errno, so test_verifier should
save it before calling it if test_verifier wants to print a reason why
verifying a BPF program of a supported type failed.

Fixes: 8184d44c9a57 ("selftests/bpf: skip verifier tests for unsupported program types")
Cc: Stanislav Fomichev <sdf@xxxxxxxxxx>
Signed-off-by: Krzesimir Nowak <krzesimir@xxxxxxxxxx>
---
 tools/testing/selftests/bpf/test_verifier.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 12589da13487..779e30b96ded 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -867,6 +867,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 	int fixup_skips;
 	__u32 pflags;
 	int i, err;
+	int saved_errno;
 
 	for (i = 0; i < MAX_NR_MAPS; i++)
 		map_fds[i] = -1;
@@ -894,6 +895,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 		pflags |= BPF_F_ANY_ALIGNMENT;
 	fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags,
 				     "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 4);
+	saved_errno = errno;
 	if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
 		printf("SKIP (unsupported program type %d)\n", prog_type);
 		skips++;
@@ -910,7 +912,7 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 	if (expected_ret == ACCEPT) {
 		if (fd_prog < 0) {
 			printf("FAIL\nFailed to load prog '%s'!\n",
-			       strerror(errno));
+			       strerror(saved_errno));
 			goto fail_log;
 		}
 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
-- 
2.20.1