linux-kernel - [PATCH] bpf: fix return in bpf_skb_adjust

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Date:   Thu, 13 Jul 2017 14:27:58 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH] bpf: fix return in bpf_skb_adjust_net

The bpf_skb_adjust_net() ignores the return value of bpf_skb_net_shrink/grow,
and always return 0, fix it by return 'ret'.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 net/core/filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index c7f7370..f44fc22 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2248,7 +2248,7 @@ static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff)
 		       bpf_skb_net_grow(skb, len_diff_abs);
 
 	bpf_compute_data_end(skb);
-	return 0;
+	return ret;
 }
 
 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
-- 
1.8.3.1