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

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Date:   Thu, 18 Apr 2019 19:57:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Balbir Singh <sblbir@...n.com>
Subject: [PATCH 4.14 76/92] bpf: fix stack state printing in verifier log

From: Alexei Starovoitov <ast@...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 <ast@...nel.org>
Acked-by: John Fastabend <john.fastabend@...il.com>
Acked-by: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Signed-off-by: Balbir Singh <sblbir@...n.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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");