diff options
| -rw-r--r-- | tools/testing/selftests/bpf/progs/dummy_st_ops_success.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/tools/testing/selftests/bpf/progs/dummy_st_ops_success.c b/tools/testing/selftests/bpf/progs/dummy_st_ops_success.c index 1efa746c25dc..cc7b69b001aa 100644 --- a/tools/testing/selftests/bpf/progs/dummy_st_ops_success.c +++ b/tools/testing/selftests/bpf/progs/dummy_st_ops_success.c @@ -11,8 +11,17 @@ int BPF_PROG(test_1, struct bpf_dummy_ops_state *state) { int ret; - if (!state) - return 0xf2f3f4f5; + /* Check that 'state' nullable status is detected correctly. + * If 'state' argument would be assumed non-null by verifier + * the code below would be deleted as dead (which it shouldn't). + * Hide it from the compiler behind 'asm' block to avoid + * unnecessary optimizations. + */ + asm volatile ( + "if %[state] != 0 goto +2;" + "r0 = 0xf2f3f4f5;" + "exit;" + ::[state]"p"(state)); ret = state->val; state->val = 0x5a; |