bpf: fix stack state printing in verifier log

fix incorrect stack state prints in print_verifier_state() Fixes: 638f5b9 ("bpf: reduce verifier memory consumption") Signed-off-by: Alexei Starovoitov <[email protected]> Acked-by: John Fastabend <[email protected]> Acked-by: Daniel Borkmann <[email protected]> Signed-off-by: Daniel Borkmann <[email protected]>
fracktal · Dec 1, 2017 · 12a3cc8 · 12a3cc8
1 parent 51de082
commit 12a3cc8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
@@ -279,7 +279,7 @@ static void print_verifier_state(struct bpf_verifier_env *env,
 	for (i = 0; i < state->allocated_stack / BPF_REG_SIZE; i++) {
 		if (state->stack[i].slot_type[0] == STACK_SPILL)
 			verbose(env, " 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(env, "\n");