[PATCH 4.14 76/92] bpf: fix stack state printing in verifier log

[Greg Kroah-Hartman]

From: Alexei Starovoitov <a...@fb.com>

commit 12a3cc8424fe1237aaeb982dec4f0914ddd22f3e upstream.

fix incorrect stack state prints in print_verifier_state()

Fixes: 638f5b90d460 ("bpf: reduce verifier memory consumption")
Signed-off-by: Alexei Starovoitov <a...@kernel.org>
Acked-by: John Fastabend <john.fastab...@gmail.com>
Acked-by: Daniel Borkmann <dan...@iogearbox.net>
Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
Signed-off-by: Balbir Singh <sbl...@amzn.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 kernel/bpf/verifier.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -268,7 +268,7 @@ static void print_verifier_state(struct
        for (i = 0; i < state->allocated_stack / BPF_REG_SIZE; i++) {
                if (state->stack[i].slot_type[0] == STACK_SPILL)
                        verbose(" fp%d=%s",
-                               -MAX_BPF_STACK + i * BPF_REG_SIZE,
+                               (-i - 1) * BPF_REG_SIZE,
                                reg_type_str[state->stack[i].spilled_ptr.type]);
        }
        verbose("\n");